We got to 1 nap at about 13 months... but dd was never a very good afternoon napper- liked to take long morning naps, but just 30-45 minutes in the afternoon. With that said, will the nursery let you designate a nap time? If yes, then I would choose 10-15 minutes after lunch, and stick with that, whether baby is at home or there. And if she wakes early then try to resettle for about 15 minutes. I try for 5 1/4 awake hours in the am and 5 awake hours in the pm- and then we usually get 11 1/2 to 12 hours every night. HTH