Hmm, interesting.

My daughter who is 10 months old today will occasionally (very rarely) have a 3 hour nap in one go (yesterday's morning nap being like that). She generally has two naps a day ranging from anywhere between 1-2 hours. And sleeps through the night too, 8-9 hours is the usual for night time, can sometimes be longer or shorter just depends on her.

I sometimes worry about letting her go over that 3 hours, worry that she might not sleep that night. Even though she does but I like my sleep lol so I don't want to ruin her sleeping through the night.