I don't remember how long it took the first time I played. Maybe a few days, with some cheating. Devan actually seriously was really difficult to beat, but that was like five years ago.

The last time I played was showing mcatis how to play, and beat the entire thing in less than an hour, without really trying to get everything.

After the 1.23 patch came out it reset the episodes so I decided to play them all for real to beat it and get as much as I could and explore as much as possible. It took me a couple days, and the only cheats I used were jjnowall and jjfly in order to get out of walls it got stuck inside. The only times I died were by accident, and I died about 3 times in total, and ending with about 60 lives. Oh, and it was on the hardest setting (not that that is hard at all). JJ2 SP is ridiculously easy, which is part of why I was always inspired to make SP levels and to make them difficult.