DS is only 16 months (just under, actually), but not sleeping nearly as well as most on here!
He sleeps reasonably well from about 7pm-5:30am, then he might get up, might get up then snooze in the pram for a bit.
He usually then has a longish (60 mins approx) morning nap (shorter if he's slept till a reasonable hour in the morning), then a shortish afternoon nap (30-45 mins). It's hugely annoying as I feel he'd have a decent lunch time nap if he was sleeping long enough at night, but I just can't keep him up when he's started his day at 6am!
We battled with GF for months when he was little, and eventually came to the conclusion that some babies just have different sleep rhythms. And I really really tried! I wanted that long nap!