If your in adult maybe time. But a child don't worry about it
Depends on the State, degree of assault, and what actually happened. Could be community service if it wasn't too serious of an assault. If you broke a bone or sent him to the hospital you could be looking at prison.
Depending on your age and the person you assaulted, because it can range from a fine to community services, but it is a offense which starts a trail for the rest of your life.....the best to you