I think it should be longer. It feels like I should be making the game now and submitting during those 7 days that the submissions are open. I don't feel any pressure to make a game for this Game Jam and I think it's counter intuitive. I think the time to make a game should be 1 month not 7 days. I don't feel like I'm starting my project, it's kind of backwards for a game jam. At least for me the reason I join a game jam is that I need to feel pressure and a deadline to make and submit my game.

Sorry for the late reply. The idea for the jam isn't necessarily to make a fully fledged game. It's more to just to make a short jam game, alternatively a prototype. Moreover it's easier for most people to spend a week on a jam than it is to spend a month. I do get that longer jams can be fun but I don't think it would fit this jam.