My experience at the Dallas Rally- was waiting since 4 AM. When POTUS came out it was late evening I don't remember. I do remember it being very LOUD to the point my organs vibrated and my hearing was off the next day. Halfway during POTUS's speech folks started leaving. Some had to work night shifts (the guy next to us had to leave to go to work). Some folks were flat out tired and had a three hour drive to get home and then go to work. (There were people from Oklahoma at the rally and the west side of Ft. Worth) Many reason that folks leave early, not just lefties occupying seats.
I did not get home until around mid night.