Both of my girls went to one nap around the time they started walking so for DD1 that was 17months but for DD2 it was 11months.

DD2 (now 13months) goes to nap around 9-10am (wakes around 5-6am) and sleeps between 2-3hrs (usually 2hrs on days DD1 is home and 3hrs when DD1 is at kindy). She then goes to bed at night around 6-7pm.