Tbh, I find the type of nappy doesn't matter, it's the quality of the cover that stops the leaking. With the flat nappies, 2 hours tops. With the fitted, up to 3 hours before a change. The one size stuffables leak a little if wet or just a big wee in one go.

Stormy catnaps too in the day usually, unless ill. But as he sleeps longer at night, I don't mind. Liebling would sleep beautifully in the day and was a shocker at night.