I can't do it unless it's pretty cool outside. Where I'm at, it's pretty overcast, which does help. I just don't care for these unseasonably warm afternoons.
Perfect all-day sit weather is overcast, very light wind, and a high of no more than 45 or 50.
My problem isn't patience, it's comfort. I have been hunting bare-bones all year, which means I'm not packing in any comfortable chairs/stands. Unfortunately, that cuts my patience in half (or less).
Hats off to you on your commitment - I hope it pays off.