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In the administration console, check the class of service settings. Under the 'advanced' section in the CoS there is the Email Retention Policy. Here you can set the deletion timescales for the trash can if you need to.
It's also dependent on your zimbraMailPurgeSleepInterval for the actual deletion process; default is 1m so you can purge ~1440 accounts per day. Mailbox Purge - Zimbra :: Wiki