J was a 45 min day napper, until he reached about 15 months. Then suddenly he started sleeping for 3 hours.
The issue that we are having now is that he doesn't want to go to bed as he thinks that he is missing out. does anyone else's kiddies do that? He goes to his cot and howls!! It lasts about 5 mins, and then he realises that it is in fact bed time and more often than not he will settle.