S.L.
My son is 5 and holds it forever. He will literally be standing and doing the side to side, keep your legs together dance - and still REFUSE to pee, telling us he doesn't have to go. He then rushes at the last minute to go. I know it's not good to hold your pee, but he isn't bothered by it, he never has accidents - he just waits until the last minute to go. It's like he's too busy/preoccupied to waste his time going.