Toddler napping

Hey ladies my son is 22 months and i’m trying to change his nap schedule and bed time.

He has one nap a day usually that’s around 1.30pm until 3.30-4pm. (Sometimes he sleeps until 4.30..) and he goes to sleep at night around 9.30-10.30pm.

Today I changed his day nap to 12. He ended up sleeping around 12.40.

Now I tried putting him to sleep around 8.30, it’s currently 9.40pm and he just fell asleep.

My question is- how long should a toddler nap during the day? I feel like 3 hours is just too much and people are telling me I shouldn’t wake him, and then others say I he should be getting max 2 hours.

I just want him to be sleeping earlier at night because I am pregnant and exhausted. The last two nights he’s been sleeping at 10.30 or even 11, when I would put him into bed at 9. Also I put him in his bed and usually he makes me sit in his room until he falls asleep. I keep the room dark and he sleeps with his comfort toy, but he just doesn’t seem tired!!!

Thanks ladies