So for instance, if you were to eat a meal that ended at 8:00 PM, and then plop to the couch, watch TV, or get on your computer or go to sleep, it would be five or six hours until you have transitioned from a fed state to a fasted state. However, you can accelerate that considerably by taking a 20 or 30 minute just light walk, it doesn't have to be speed walking. It certainly doesn't have to be jogging, but just walking outside or moving around.