How many hours per week does Exchange 2003 database maintenance need?

We have one exchange store with ~185 mailboxes.
I currently have the database maintenance interval scheduled for 3-plus hours each night; avoiding backups and other processes.
Could I trim this back a bit?
If it needs 1hr, and I have it scheduled for 6 does it run over and over or only as needed?

   Thanks in advance - JD
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You should see entries in your Event Logs showing when it starts and finishes.
cconleeAuthor Commented:
Thanks.  The information needed was in the Event Log.
It did appear that the process repeated itself if the schedule permitted.
Our DB maintenance appears to take 1.5 to 2hrs.  Cheers - JD
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