My forum has 3 million postings and like 60k members.. I wanna upgrade it from 2.2 to 2.31. Would the upgrade get timed out?

Look above your post.

Do you need technical support?

You can obtain support via the client area, or you can try to obtain peer-to-peer support at IPS Beyond.

Better off going to one of those two places.

You can submit a ticket, asking for help, but if you run the upgrade doing manual sql queries, you should be fine.