Games can take a long time to make. Mixing sound, art, gamecode, environments, and user-interfaces is a process that takes lots of time. Natural Selection 2 is a prime example - It took six years to make, and six months since launch UWE is still not done with it!
Development cycles do not necessarily have to be long, however. In fact, by forcing a development into a small amount of time, creativity can be given the hot seat. This week UWE is doing just that, by holding a mod-jam. In five days, we are going to create three different games.
httpv://www.youtube.com/watch?v=2JE40f7qg5A