Haha it's up to you, really!
I've done my fair share of jams and I found that in most cases, unless you feel like you've really got something big, it is best to just take what you've learned to the next jam/project and use it as a learning curve. It's hard to decide whether something is good enough of a baseline to put more time into it or not though, and the only one who can decide this is you/your team! :D Good luck either way!