It's fairly standard for our local kids rec league to start 3rd grade games at 8:00am on Saturdays due to limited gym availability.
Many years ago I worked a boys HS rec weekend tournament and the final game started at 11:00pm on Sunday night. We didn't finish the game until after midnight. The sponsor then took my partner and me out to Denny's for a snack. I got home about 1:30am. Fortunately, (or unfortunately depending on your point of view) my wife was asleep.