The average person is pretty out of shape, I vote a month. Give them time to get into some shape, plus it shows average people how quickly you can improve your shape and lifestyle with regular excercise

I don’t think that would be fun. They would probably be so sore just from the training that they would barely be able to compete anyway. I think it would be far more interesting to see what people can learn and build up to in a relatively short amount of time. I bet you would get some pretty amazing moments.