Database Maintenance - Manual Execution

Database Maintenance - Manual Execution

We've been using OM for about 2 years.  We are a few versions behind and i want to upgrade.  I received the files from Zoho and started the process, but the backup of the DB took a full 8 hours, and never finished.  The backup process got stuck on one statistics table from May.
 
I went in to DB maintenance and changed all the settings to 3 days.  I read on a forum post that I need to wait 24 hours for the actual deletion to happen.  I'm on a tight schedule with other projects and things.  How can I manually execute this DB cleanup?
 
Thanks,

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