I just want to say that whether 4 hours is long or short is relative to the expected activity. For example, I spend 4 hours driving to and from work daily would probably be thought of as a long time. I get 4 hours of sleep at night would be thought of as a short time. 4 hours of exercise daily seems excessive for most people. 4 hours at work daily is a short time to have to work. 4 hours to eat dinner…super long.
If one group of chickens gets to free range for 30 minutes every night, and then gets 4 hours on the weekend of range time, it would probably feel like a long time. If they usually free range but one day “only” get out for 4 hours, it would seem short.