Literally forever, because as far as I know Atelier Judie is the only mainline Atelier game with no deadline. 1 year, 10 years, 100 years, you can play as long as it takes until you achieve your objective, which is to send Judie back to her original timeline after an alchemy accident knocked her 200 years into the future.
Everything else you do until then is entirely up to you. You don’t even have to repay 50,000 cole (on a 10,000 loan) to your loanshark ‘friend’ Vitoss unless you want to. Heck, you don’t even have to finish the game. You can just go round in circles until you get tired and ditch theĀ game. I’ve done it before. But let us not speak of it any more. I was young, and very very lazy. Do please go on, this is most interesting