3 hours! i can hardly make it 2 hours in a treestand. if im in a groundblind then i can make it 3 hours but thats pushing it. i think a alot of it depends on if you're seeing anything or not, if i'm not seeing any deer i can't sit long but if i'm seeing a lot then i can sit a lot longer, but when i do get up and move it seems that i see the majority of my deer.