At that age my older two (more average/high sleep needs) were doing about 5 hours A time pre and post nap (DD1 did shorter naps, 1.5/2 hrs I think, DD2 2+ hrs). For whatever reason they were always happiest to have the A times balanced and the nap exactly mid day. DD3 does not nap at all, even if she has a rough night sleep. How is he going to bed on home days when he has had a longer nap?