My baby is 10 weeks. She typically goes 8 hours but it varies between 6 and 11.

I wake my baby up after 4 hours. But that's only because my boobs hurt. lol

My baby girl sleeps for 9-10 hours (but i pick her up every 3/4 hours during the night bf and put her back in her crib she doesnt stir but it's like i can't help but check on her so why not feed her since I'm awake plus she goes right back to sleep as though she was never disturbed at all