I've sat all day a few times but it's very tough for me. 4 hours is usually plenty for me. I got a new SummitX5 this year and it's a lot more comfortable. Boredom isabout 30% reason I leave and the cold is 70%. When I can't feel my toes I gotta come down! This year I bought a bunch of "Toasty Toes" and hand warmers. I guess that should help. I told myself I'm going to hunt longer and harder than previous years! LastSaturday I sat 7 hours in the morning, took an hour break then went back out from 3:00PM till dark. Very good for me.