Just got back from a hunt in SD, hunted 4 straight days, 6 to 7 hours a day. 3 Brits, 2 ten-year-olds - one M, one F, 1 six-year-old M. I did usually have only 2 on the ground at the same time. Geriatric - no. They were tired at the end of the day as I was yes. But ready to go the next morning...