Our son is 2, and is happy to have a nap following lunch for about 3 hours! he likes his sleep, and sleeps for 11 or 12 hours at night, too.

Our daughter is 8 months, and has never been big on sleeping, in the night or day. She has a morning nap at about 9:15am, for as little as 20 minutes, or as long as 1 and a half hours, and then goes down about 1pm for about the same amount of time ?(usually no more than an hour). If she needs it, she'll have a little nap around 4:30pm - 5:00pm (if she hasn't slept much at all for the rest of the day).