For the first 12 hours of a Thread's life a check will be performed every time the Cron is run (currently every 30 minutes) to see if it has any replies. If it has no replies it will be bumped, if it has a reply then nothing will be done.
After 12 hours (you can change this by modifying the autobump_cron.php file), if the thread still has no replies, the Cron script will stop bumping it and let it die.
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