I checked the forums, the last time it was ~6 week break. We';re right now playing in LiF:YO to practice so we get a good head start. If you already have the game you'd get a discount on the MMO purchase. If not there's a lot of sales too. But if you just feel comfortable waiting, it'll be about 6 weeks I think. We all joined, got hard core cooked, and then it ended two days later :S
Will love to have you MightyD. I've never played with you but have always wanted to!