I miss nap-time!!!
We had 2 one-hour-ish naps (morning and afternoon), and a 12 hour night until my son was 2ish. ((Or rather, that was the standard. We all get the no sleep weeks, the what-the-heck-is-going-on-month, the up all night sick, the "oh yeah, the sun is coming up waaaaay earlier now, time for dark curtains and blinds" head slap, etc))
When my son was 2ish I got sick and tired of having to get "everything done" out of the house by 1030, so I nixed that particular nap. When we got rid of that nap we also LOST about an hour of him sleeping at night, until we started putting him to bed and hour and a half earlier and then he slept for 12-13 hours.
When my so was 3-ish my mum decided he didn't need naps anymore (ahem!), and started doing everything she could to get rid of his afternoon nap (showing up, offering to take him during that period, etc.) It was a losing battle. She felt that since none of US napped past the age of 2, that he shouldn't be either. That was a hard year. He SHOULD probably still have been napping (and went down very very easily for an afternoon nap until he was 4). We lost more sleep when we pulled that nap, and it's stayed at 11 hours ever since.
Remember... (I didn't have anyone tell me this until my son was over the age if 1, and I hadn't figured it out on my own) ... sleep beget sleep.
Oddly enough, for the majority of kids, the earlier you put them down, the longer they sleep. The more they nap in the daytime, the longer they sleep at night.
Kids generally need at LEAST 11 hours, and the average is 12-13 hours of sleep. When during the day/night they get it, is fairly inconsequential. I have friends whose children stopped napping at age one, and others who still have an afternoon nap at age 6. They all get about the same amount of sleep.
It's a dead givaway though, that they're ready for more sleep at night when they start getting up earlier. AKA, naptime go bye bye. It's also a common thing to start happening in the summertime, when it gets light out earlier.