I only hunt all day because it is so hard to get to and from my stand in the swamp (a half mile walk through knee high water, most of the time, with 50 pounds of gear on my back). Once I get there, I tend to stay there until it's time to come back. I also mostly see deer in the morning and evening because that's when it is the coolest out. I usually stand up the first couple of hours and the last couple (ie prime time), then in between I alternate sitting and standing. I usuallybring a book and read in the middle of the day. That does two things for me: 1) it keeps me from nodding off as much, and 2) it does help pass the time. I can still listen, and I stop every couple of pages or so to look around. Works for me anyway.