I think that depends on the kid and the age, or what they’ve been doing all day
My nearly 2yr old still naps for 1.5 hours a day, and my eldest (now 5yrs old) napped until he was 2.5/nearly 3yrs.
My 2 yr old naps for 2 hours during the day while older sister is at school during the week. My oldest will be five in December and will NOT nap hasn't since she was about two or three.
My 17m old rarely naps now since moving her to a bed, she's too nosey to nap! I do try every day in the hope she will nap lol