Usually it is one month per upgrade. And then if you need more time you can always just buy an extension separately. There is a note somewhere on the upgrades page that will explain it a bit more.
No worries guys, they work again, woohoooooo!! Thanks for your help @Pacifico and thanks @"Dillon A. Wright" for the help i'm sure you'd have given once you saw it, but panic over!
@"Dillon A. Wright" said:
They aren't 100% complete, but we're working on it. ETA is end of the week, but don't quote me on that. Once it's fully available, I'll announce it on the forums.
Thanks for all your hard work. I was wondering if PT 75 explanation will be part of the Ultimate Plus Package? I plan to upgrade (I have Ultimate Package), so it would be helpful to know. Thanks!