diff --git a/resources/sql/autopatches/20140807.harbormastertargettime.sql b/resources/sql/autopatches/20140807.harbormastertargettime.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20140807.harbormastertargettime.sql
@@ -0,0 +1,5 @@
+ALTER TABLE {$NAMESPACE}_harbormaster.harbormaster_buildtarget
+  ADD dateStarted INT UNSIGNED NULL;
+
+ALTER TABLE {$NAMESPACE}_harbormaster.harbormaster_buildtarget
+  ADD dateCompleted INT UNSIGNED NULL;
diff --git a/src/applications/harbormaster/controller/HarbormasterBuildViewController.php b/src/applications/harbormaster/controller/HarbormasterBuildViewController.php
--- a/src/applications/harbormaster/controller/HarbormasterBuildViewController.php
+++ b/src/applications/harbormaster/controller/HarbormasterBuildViewController.php
@@ -94,6 +94,28 @@
       $status_view->addItem($item);
 
       $properties->addProperty(pht('Name'), $build_target->getName());
+
+      if ($build_target->getDateStarted() !== null) {
+        $properties->addProperty(
+          pht('Started'),
+          phabricator_datetime($build_target->getDateStarted(), $viewer));
+        if ($build_target->isComplete()) {
+          $properties->addProperty(
+            pht('Completed'),
+            phabricator_datetime($build_target->getDateCompleted(), $viewer));
+          $properties->addProperty(
+            pht('Duration'),
+            phutil_format_relative_time_detailed(
+              $build_target->getDateCompleted() -
+              $build_target->getDateStarted()));
+        } else {
+          $properties->addProperty(
+            pht('Elapsed'),
+            phutil_format_relative_time_detailed(
+              time() - $build_target->getDateStarted()));
+        }
+      }
+
       $properties->addProperty(pht('Status'), $status_view);
 
       $target_box->addPropertyList($properties, pht('Overview'));
@@ -192,7 +214,10 @@
       ->setFlush(true);
 
     foreach ($artifacts as $artifact) {
-      $list->addItem($artifact->getObjectItemView($viewer));
+      $item = $artifact->getObjectItemView($viewer);
+      if ($item !== null) {
+        $list->addItem($item);
+      }
     }
 
     return $list;
diff --git a/src/applications/harbormaster/storage/build/HarbormasterBuildTarget.php b/src/applications/harbormaster/storage/build/HarbormasterBuildTarget.php
--- a/src/applications/harbormaster/storage/build/HarbormasterBuildTarget.php
+++ b/src/applications/harbormaster/storage/build/HarbormasterBuildTarget.php
@@ -10,6 +10,8 @@
   protected $details;
   protected $variables;
   protected $targetStatus;
+  protected $dateStarted;
+  protected $dateCompleted;
 
   const STATUS_PENDING = 'target/pending';
   const STATUS_BUILDING = 'target/building';
diff --git a/src/applications/harbormaster/worker/HarbormasterTargetWorker.php b/src/applications/harbormaster/worker/HarbormasterTargetWorker.php
--- a/src/applications/harbormaster/worker/HarbormasterTargetWorker.php
+++ b/src/applications/harbormaster/worker/HarbormasterTargetWorker.php
@@ -35,6 +35,8 @@
     $build = $target->getBuild();
     $viewer = $this->getViewer();
 
+    $target->setDateStarted(time());
+
     try {
       $status_pending = HarbormasterBuildTarget::STATUS_PENDING;
       if ($target->getTargetStatus() == $status_pending) {
@@ -51,6 +53,11 @@
       }
 
       $target->setTargetStatus($next_status);
+
+      if ($target->isComplete()) {
+        $target->setDateCompleted(time());
+      }
+
       $target->save();
     } catch (PhabricatorWorkerYieldException $ex) {
       // If the target wants to yield, let that escape without further
@@ -59,6 +66,7 @@
     } catch (HarbormasterBuildFailureException $ex) {
       // A build step wants to fail explicitly.
       $target->setTargetStatus(HarbormasterBuildTarget::STATUS_FAILED);
+      $target->setDateCompleted(time());
       $target->save();
     } catch (Exception $ex) {
       phlog($ex);
@@ -73,6 +81,7 @@
       }
 
       $target->setTargetStatus(HarbormasterBuildTarget::STATUS_FAILED);
+      $target->setDateCompleted(time());
       $target->save();
     }