And how old is he/she?
I've been trying to get T to sleep more overnight, without much success. The longest he has gone is 10.5 hours (this does include wake ups...) but he more routinely sleeps 9.5 hours (including wakeups) and then won't go back to sleep. Example - last night in bed at 7:45 and up for the day at 5:45 with 2 wakeups. If he sleeps 9.5 hours he will take a long first morning nap (2 hours) but then only 30-45 minute naps the rest of the day. So, I know he's not getting enough sleep and is probably overtired. He's 3.5 months old.
EDIT: He usually does not wake up 2x a night, but we are off schedule following a vacation and also are trying to get him in his crib...usually he would sleep 6.5 then 3, 7 then 2.5 or some other combination of better sleep!