J.S.
My son moved from two naps to one nap around 14 months or so. He began napping from around 1-4. It was fantastic!! At first he would get cranky around 10 (when his nap used to be), but if I kept him active he'd make it until after lunch...then we were golden! It will take some time to get them adjusted, but it makes life so much easier. Just be cautious of running too many errands in the morning for a while...that car ride tended to wipe mine out! My oldest is 3 1/2 now & just gave naps up about a month ago. Too bad for me. Good luck to you!