So I need to upgrade from 4.5.5 to 4.5.6, and have a data-store of over 130G of emails on about 250 accounts. I know in the docs it mentions taking about an hour to process 400 users with 1000 emails each, but does the size of the email body matter, or is it all based on header info? Just want an estimate of how long I need to schedule an outage for. It took over a week to imapcopy/imapsync the old emails during install/migration. I can't take that long again for an upgrade.