My son always sleeps a good 12-13 hours. His bedtime is usually 7:30-8pm but sometimes on the weekend it's a little later. This weekend he had a 9pm bedtime and a 10pm, and both times he still slept over 12 hours!
On a normal weekday he sleeps until 8:30. I think it's the perfect time and I love getting up at that time. I never wanted the baby that got up between 6-7am. I hope he never regresses into that!