I would not let a child sleep to 4pm. A 20 month old child is typically in bed for 7pm maybe 8pm and that's too long to nap too late in day and will mess up bed time.
My children go down at noon. My older children I wake up at 2pm. My under 2's I will let sleep until they wake but no later than 3pm. They normally all awake by 2.30pm until sick and then if Mom said they have bad night, I might leave until 3pm. We have afternoon snack and other things to do. My parents would be very cross if a child sleeping until 4pm.
Maybe think about max 3 hours and possibly move to noon so it not so close to bedtime when they get up from nap?

































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