Just slept for 5 hours

Is it normal for a newborn to sleep for that long. My baby is 9 days old today and i forgot to set my alarm for 3 hours and he woke me up about an hour ago to eat, but he fell asleep around 10 o clock, before he fell asleep he ate for around 25 minutes but after he woke up he would only eat for a little over 15 minutes. Should I be worried?