We also got an app built and deployed, a simple little game: http://marryboffkill.com
The whole time I expected that it would be the smoothing-over of rough edges, double-checking, and doing general "cleanup" that would take the most time, but even so was surprised how quickly the deadline snuck up on us the last day.
I have a feeling if the rumble was over a long weekend instead we would have been able to clean up all the rough edges, but I have a feeling there are many other teams in this boat as well. :-)
Was definitely a great way to spend a weekend (creating something) with friends and a real learning experience. I'm already excited to do it again next year.