How long will it take when a clean database command is issued on the exchange managament shell

Hi
We have around 1900 mailboxes and when I disable mailboxes it doesn't come under the Disconnected Mailbox.
If  I give the clean database command , how long will it take to complete the clean on an average
During this process will the exchange 2007 mail server be down be down.

 Thanks
lianne143Asked:
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AmitIT ArchitectCommented:
Deleted mailboxes will be store as per Database retention policy. If you want to remove them forcefully use these kb's:
http://community.spiceworks.com/how_to/4269-remove-disconnected-exchange-2007-mailboxes
http://www.geekyprojects.com/microsoft-server-tutorials/how-to-purge-or-delete-a-disconnected-mailbox-in-exchange-2007/

Or leave it, it will be gone automatically, once it reaches db retention period.
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Will SzymkowskiSenior Solution ArchitectCommented:
give the clean database command , how long will it take to complete the clean on an average
When this command is run, and completes this process is also completed. It should be immediate after the clean-mailboxdatabase cmdlet has run.

During this process will the exchange 2007 mail server be down be down
No the database will still be online and accessible. Clean-mailboxdatabase is basically forcing online maintenance. The same process happens nightly when Online maintenance is performed.

Will.
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