If you put the right team together in the right environment, you can launch something valuable (MVP, prototype) in a weekend.<p>My main experience with this was a corporate hackathon where a bunch of developers just decided they wanted to build a new product that was different than the one we worked on everyday. That was 7 developers for 24 hours and I'd say we launched a pretty cool product. (<a href="http://www.metrodenverapartments.com/" rel="nofollow">http://www.metrodenverapartments.com/</a> , and about 9 other domains. Looks like the images have broken since.) Also, I was able to demo the product I'm currently working on to potential customers after less than 20 hours of development. At that point the demo was enough that people were willing to commit to paying for it.<p>It's experiences like this (and seeing others doing the same thing) that make me think these events have value. Here's a quote from <a href="http://startnorfolk.com/" rel="nofollow">http://startnorfolk.com/</a> (an event my employer and other local businesses are putting on.) Emphasis is mine.<p>"an intense 48 hour event which focuses on building a web or mobile application <i>which could form the basis of</i> a credible business"<p>Where is the snake oil in that? My experience is that you really can do something awesome in one weekend if you get together with the right people. It could also form the basis of a credible business. The registration fee is well justified, as it covers food and drinks throughout the weekend. The $10,000 prize is paid for by sponsors.