diff --git a/src/ref/revision/ArcanistRevisionRef.php b/src/ref/revision/ArcanistRevisionRef.php
--- a/src/ref/revision/ArcanistRevisionRef.php
+++ b/src/ref/revision/ArcanistRevisionRef.php
@@ -70,6 +70,11 @@
     $status_value = idx($value_map, idx($dict, 'status'));
     $ansi_color = idx($color_map, $status_value);
 
+    $date_created = null;
+    if (isset($dict['dateCreated'])) {
+      $date_created = (int)$dict['dateCreated'];
+    }
+
     $dict['fields'] = array(
       'uri' => idx($dict, 'uri'),
       'title' => idx($dict, 'title'),
@@ -80,6 +85,7 @@
         'value' => $status_value,
         'color.ansi' => $ansi_color,
       ),
+      'dateCreated' => $date_created,
     );
 
     return self::newFromConduit($dict);
@@ -104,6 +110,10 @@
     return idxv($this->parameters, array('fields', 'status', 'color.ansi'));
   }
 
+  public function getDateCreated() {
+    return idxv($this->parameters, array('fields', 'dateCreated'));
+  }
+
   public function isStatusChangesPlanned() {
     $status = $this->getStatus();
     return ($status === 'changes-planned');
diff --git a/src/repository/graph/query/ArcanistCommitGraphQuery.php b/src/repository/graph/query/ArcanistCommitGraphQuery.php
--- a/src/repository/graph/query/ArcanistCommitGraphQuery.php
+++ b/src/repository/graph/query/ArcanistCommitGraphQuery.php
@@ -7,8 +7,9 @@
   private $headHashes;
   private $tailHashes;
   private $exactHashes;
-  private $stopAtGCA;
   private $limit;
+  private $minimumEpoch;
+  private $maximumEpoch;
 
   final public function setGraph(ArcanistCommitGraph $graph) {
     $this->graph = $graph;
@@ -46,11 +47,6 @@
     return $this->exactHashes;
   }
 
-  final public function withStopAtGCA($stop_gca) {
-    $this->stopAtGCA = $stop_gca;
-    return $this;
-  }
-
   final public function setLimit($limit) {
     $this->limit = $limit;
     return $this;
@@ -60,6 +56,20 @@
     return $this->limit;
   }
 
+  final public function withEpochRange($min, $max) {
+    $this->minimumEpoch = $min;
+    $this->maximumEpoch = $max;
+    return $this;
+  }
+
+  final public function getMinimumEpoch() {
+    return $this->minimumEpoch;
+  }
+
+  final public function getMaximumEpoch() {
+    return $this->maximumEpoch;
+  }
+
   final public function getRepositoryAPI() {
     return $this->getGraph()->getRepositoryAPI();
   }
diff --git a/src/repository/graph/query/ArcanistGitCommitGraphQuery.php b/src/repository/graph/query/ArcanistGitCommitGraphQuery.php
--- a/src/repository/graph/query/ArcanistGitCommitGraphQuery.php
+++ b/src/repository/graph/query/ArcanistGitCommitGraphQuery.php
@@ -3,17 +3,21 @@
 final class ArcanistGitCommitGraphQuery
   extends ArcanistCommitGraphQuery {
 
-  private $queryFuture;
   private $seen = array();
+  private $futures = array();
+  private $iterators = array();
+  private $cursors = array();
+  private $iteratorKey = 0;
 
   public function execute() {
-    $this->beginExecute();
-    $this->continueExecute();
+    $this->newFutures();
+
+    $this->executeIterators();
 
     return $this->seen;
   }
 
-  protected function beginExecute() {
+  private function newFutures() {
     $head_hashes = $this->getHeadHashes();
     $exact_hashes = $this->getExactHashes();
 
@@ -22,72 +26,122 @@
     }
 
     $api = $this->getRepositoryAPI();
+    $ref_lists = array();
 
-    $refs = array();
-    if ($head_hashes !== null) {
-      foreach ($head_hashes as $hash) {
-        $refs[] = $hash;
+    if ($head_hashes) {
+      $refs = array();
+      if ($head_hashes !== null) {
+        foreach ($head_hashes as $hash) {
+          $refs[] = $hash;
+        }
       }
-    }
 
-    $tail_hashes = $this->getTailHashes();
-    if ($tail_hashes !== null) {
-      foreach ($tail_hashes as $tail_hash) {
-        $refs[] = sprintf('^%s^@', $tail_hash);
+      $tail_hashes = $this->getTailHashes();
+      if ($tail_hashes !== null) {
+        foreach ($tail_hashes as $tail_hash) {
+          $refs[] = sprintf('^%s^@', $tail_hash);
+        }
       }
+
+      $ref_lists[] = $refs;
     }
 
     if ($exact_hashes !== null) {
-      if (count($exact_hashes) > 1) {
-        // If "A" is a parent of "B" and we search for exact hashes ["A", "B"],
-        // the exclusion rule generated by "^B^@" is stronger than the inclusion
-        // rule generated by "A" and we don't get "A" in the result set.
-        throw new Exception(
-          pht(
-            'TODO: Multiple exact hashes not supported under Git.'));
-      }
       foreach ($exact_hashes as $exact_hash) {
-        $refs[] = $exact_hash;
-        $refs[] = sprintf('^%s^@', $exact_hash);
+        $ref_list = array();
+        $ref_list[] = $exact_hash;
+        $ref_list[] = sprintf('^%s^@', $exact_hash);
+        $ref_list[] = '--';
+        $ref_lists[] = $ref_list;
       }
     }
 
-    $refs[] = '--';
-    $refs = implode("\n", $refs)."\n";
+    $flags = array();
+
+    $min_epoch = $this->getMinimumEpoch();
+    if ($min_epoch !== null) {
+      $flags[] = '--after';
+      $flags[] = date('c', $min_epoch);
+    }
+
+    $max_epoch = $this->getMaximumEpoch();
+    if ($max_epoch !== null) {
+      $flags[] = '--before';
+      $flags[] = date('c', $max_epoch);
+    }
+
+    foreach ($ref_lists as $ref_list) {
+      $ref_blob = implode("\n", $ref_list)."\n";
+
+      $fields = array(
+        '%e',
+        '%H',
+        '%P',
+        '%ct',
+        '%B',
+      );
+
+      $format = implode('%x02', $fields).'%x01';
+
+      $future = $api->newFuture(
+        'log --format=%s %Ls --stdin',
+        $format,
+        $flags);
+      $future->write($ref_blob);
+      $future->setResolveOnError(true);
+
+      $this->futures[] = $future;
+    }
+  }
+
+  private function executeIterators() {
+    while ($this->futures || $this->iterators) {
+      $iterator_limit = 8;
 
-    $fields = array(
-      '%e',
-      '%H',
-      '%P',
-      '%ct',
-      '%B',
-    );
+      while (count($this->iterators) < $iterator_limit) {
+        if (!$this->futures) {
+          break;
+        }
 
-    $format = implode('%x02', $fields).'%x01';
+        $future = array_pop($this->futures);
+        $future->startFuture();
 
-    $future = $api->newFuture(
-      'log --format=%s --stdin',
-      $format);
-    $future->write($refs);
-    $future->setResolveOnError(true);
-    $future->start();
+        $iterator = id(new LinesOfALargeExecFuture($future))
+          ->setDelimiter("\1");
+        $iterator->rewind();
 
-    $lines = id(new LinesOfALargeExecFuture($future))
-      ->setDelimiter("\1");
-    $lines->rewind();
+        $iterator_key = $this->getNextIteratorKey();
+        $this->iterators[$iterator_key] = $iterator;
+      }
+
+      $limit = $this->getLimit();
 
-    $this->queryFuture = $lines;
+      foreach ($this->iterators as $iterator_key => $iterator) {
+        $this->executeIterator($iterator_key, $iterator);
+
+        if ($limit) {
+          if (count($this->seen) >= $limit) {
+            return;
+          }
+        }
+      }
+    }
+  }
+
+  private function getNextIteratorKey() {
+    return $this->iteratorKey++;
   }
 
-  protected function continueExecute() {
+  private function executeIterator($iterator_key, $lines) {
     $graph = $this->getGraph();
     $limit = $this->getLimit();
 
-    $lines = $this->queryFuture;
+    $is_done = false;
 
     while (true) {
       if (!$lines->valid()) {
-        return false;
+        $is_done = true;
+        break;
       }
 
       $line = $lines->current();
@@ -133,6 +187,7 @@
 
           $parent_nodes[$parent] = $parent_node;
           $parent_node->addChildNode($node);
+
         }
         $node->setParentNodes($parent_nodes);
       } else {
@@ -145,6 +200,10 @@
         }
       }
     }
+
+    if ($is_done) {
+      unset($this->iterators[$iterator_key]);
+    }
   }
 
 }
diff --git a/src/repository/graph/query/ArcanistMercurialCommitGraphQuery.php b/src/repository/graph/query/ArcanistMercurialCommitGraphQuery.php
--- a/src/repository/graph/query/ArcanistMercurialCommitGraphQuery.php
+++ b/src/repository/graph/query/ArcanistMercurialCommitGraphQuery.php
@@ -47,7 +47,7 @@
 
     if ($revsets) {
       $revsets = array(
-        $this->joinAndRevsets($revs),
+        $this->joinAndRevsets($revsets),
       );
     }
 
@@ -58,12 +58,10 @@
           '%s',
           $exact_hash);
       }
-      $revsets[] = array(
-        $this->joinOrRevsets($revs),
-      );
+      $revsets[] = $this->joinOrRevsets($revs);
     }
 
-    $revsets = $this->joinOrRevsets($revs);
+    $revsets = $this->joinOrRevsets($revsets);
 
     $fields = array(
       '', // Placeholder for "encoding".
@@ -75,10 +73,42 @@
 
     $template = implode("\2", $fields)."\1";
 
+    $flags = array();
+
+    $min_epoch = $this->getMinimumEpoch();
+    $max_epoch = $this->getMaximumEpoch();
+    if ($min_epoch !== null || $max_epoch !== null) {
+      $flags[] = '--date';
+
+      if ($min_epoch !== null) {
+        $min_epoch = date('c', $min_epoch);
+      }
+
+      if ($max_epoch !== null) {
+        $max_epoch = date('c', $max_epoch);
+      }
+
+      if ($min_epoch !== null && $max_epoch !== null) {
+        $flags[] = sprintf(
+          '%s to %s',
+          $min_epoch,
+          $max_epoch);
+      } else if ($min_epoch) {
+        $flags[] = sprintf(
+          '>%s',
+          $min_epoch);
+      } else {
+        $flags[] = sprintf(
+          '<%s',
+          $max_epoch);
+      }
+    }
+
     $future = $api->newFuture(
-      'log --rev %s --template %s --',
+      'log --rev %s --template %s %Ls --',
       $revsets,
-      $template);
+      $template,
+      $flags);
     $future->setResolveOnError(true);
     $future->start();
 
diff --git a/src/workflow/ArcanistMarkersWorkflow.php b/src/workflow/ArcanistMarkersWorkflow.php
--- a/src/workflow/ArcanistMarkersWorkflow.php
+++ b/src/workflow/ArcanistMarkersWorkflow.php
@@ -60,17 +60,11 @@
     }
 
     if ($disjoint_heads) {
+      $disjoint_nodes = $graph->newQuery()
+        ->withExactHashes($disjoint_heads)
+        ->execute();
 
-      // TODO: Git currently can not query for more than one exact hash at a
-      // time.
-
-      foreach ($disjoint_heads as $disjoint_head) {
-        $disjoint_nodes = $graph->newQuery()
-          ->withExactHashes(array($disjoint_head))
-          ->execute();
-
-        $nodes += $disjoint_nodes;
-      }
+      $nodes += $disjoint_nodes;
     }
 
     $state_refs = array();