vB 3.8 Forum Conversion - How Long for 5+ Million Posts?

[DeltaHF]

I'm considering converting my vBulletin 3.8 forum, with approximately 191k users and 5.3 million posts, to XenForo. I was looking at IP.Board, but after toying with IPB 3.2's converter script, I found it would take an unreasonably and unacceptably long amount of downtime (several days) to actually make the switch.

Could anyone offer a general estimate as to how long this process would take with XF?

 

[Digital Doctor]

Ask here: http://xenforo.com/community/threads/big-bigger-biggest-xf-forums.15638/
Here is some data:
http://xenforo.com/community/thread...at-has-migrated-to-xf.6760/page-3#post-134578
- it was in December though.
- it did 372,303 posts in 3 hours 17 minutes.
* Note: I do know the importer is faster than that now.
Here is another big board pre-sales thread.