Created a custom daemon which dumps out the config hash:
```lang=php, name=src/extensions/PhabricatorDebugDaemon.php
<?php
final class PhabricatorDebugDaemon extends PhabricatorDaemon {
protected function run() {
do {
PhabricatorCaches::destroyRequestCache();
echo PhabricatorEnv::calculateEnvironmentHash();
$this->sleep(1);
} while (!$this->shouldExit());
}
}
```
Ran this daemon and saw the config hash update within 30 seconds.