My son is 18m and takes a 2 1/2 hour nap at 1:45 and goes to bed between 8:45&9:30

My sons been on a schedule since he was about 10 months old. He naps from 12-2 every day then goes to sleep between 8 and 9:30 just depends on how tired he's acting. It helped a lot getting him on a really good schedule and striking to it even though some days it's a little off

I would make nap time closer to the mid afternoon and not let him sleep close to bedtime which I usually put my son down at 7 or 630 he takes a nap from about 1030 to like 130 so he doesn't nap until he goes to bed at night and he's tired by then so it works , my son is almost 17 months