An hour! That isn't 'time out'. Time out is supposed to be a short amount of time to 'calm down, and think about their actions / behavior ( if old enough). It's generally recommended about 1 minute for each yet of age (restarting each time they leave without permission).

My kids not longer get set times even - they know that once they have calmed down and are ready to talk (discuss what went wrong) they can come to me and we will talk - then they will get punishments if it is serious enough or have to make apologies etc.