Sitting all day is the ONLY way to hunt the rut as far I'm concerned. A harness is aMUST because of the possibility of nodding off! I saw the biggest buck of my life last year at 12:00PM! So it does pay to sit all day.
If you come out of the woods at 11:00AM, and go back in at 2:00PM each day of a 6 day hunt,you're loosing 18hrs of hunting time.That's almost 2 full days worth of hunting the most productive time of the year, the rut! This is the way I see it, anyway.