A few hours might be tough, but it’s a reasonable goal. Blinds are a necessity at that age. My 6 year old makes it 1.5-2 hours before the food’s eaten, entertainment has lost its appeal, and the blind starts to feel like a prison rather than a fort. All kids are different however.
Binoculars and cameras make it a bit nicer, gives them something else to do.
I think more than anything, it’s the attitude it takes to put them first in the situation that’s hardest. As sportsmen, we work hard to scout, plan, and overall just do our best. Their goals are very often not even close to your own, and usually don’t necessarily involve even seeing a turkey. That’s why at least for my 6 year old, it might be until he’s 7 (this year?) or 8 before he goes with me on a “real” turkey hunt. We’ve been on quite a few “mock” hunts, where I set up the blind, do some calling, and bring in birds for them. That said, I’ve thrown the blind over and onto the ground before with turkeys in the field because of a little boy that was sick and tired of being cooped up in it too long.
When they’re ready, they’re ready, and I think that’s a different age for each kid.
Joel