Hunting is my passion, so I try to get out as long as I can. But in early bow season (ours starts next Saturday), I'll get out before first light and sit on the stand until around 11:00. After that it starts getting warm (we're still in the 80's here in SW Ohio in late Sept/early October) and things slow down as the deer are bedded. If I can get out again for a late afternoon hunt, I may hunt for about 3 hours (until sunset). It kind of worries me with the warm weather and the meat spoiling, so my theory is if I get one in the a.m., then I track it ASAP and get it on ice right away. If I kill one in afternoon, pretty much the same is done, but at least the evening is cooler so I feel a little better that the meat will not spoil as quick and I will butcher it up that night. But once temps get in 50's or lower, I will sit all day as many days that I get a chance.
The time flies for me, so luckily 8+ hour sits (with a break for lunch in my truck and/or a quick stalk around some of the property perimeter to stretch my legs) are not a problem. To me the 8+ hours go too fast. My wife is great about deer hunting season and doesn't mind if I disappear all day every Saturday during deer season. It gives her a chance to hang out with her parents more and go shopping and do 'girl stuff' without feeling guilty that she is blowing off me or the kids on a weekend (makes me not feel guilty too). And the kids get to hang with grandma and grandpa so they are happy too because they are getting spoiled by them. We do tons of family stuff all year - I make them my first priority, so during hunting season it's 'all good'. Plus I have tons of vacation days so while the kids are at school and wifey is at work, I'm able to get in a tree all day! I'm a lucky guy!