M.H.
My daughter started preschool at 17 months old. She was still taking two naps so I switched her to one so she could have a similar schedule as she did at school. I put her down for her nap right after her lunch usually around noon and she has always slept 2-3 hours. She is now 3.5 and I put her down around 1pm and she still sleeps 2-3 hours.