Took 15 hours for us... we did it through ImpEx though. We had set up a test forum where we designed new styles, installed a whole ton of hacks, etc., so we didn't want to do the standard upgrade system... Sadly, ImpEx doesn't care about postids, userids, threadids, etc., it just puts them into the first available slot. So, I had to write my own custom script to adjust the userids so everything stayed correct. After getting all that worked out, it took 15 hours in all, 9 am to 1 am. Now our site's running awesomely, and we're not looking forward at all to the possibility of a vBulletin 4.
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