Breastfed baby sleeping 8 HR stretch...

My son is 4.5 months old. Is it ok that my BF baby is going 8 hrs over night? 
He wakes at 7am and eats and to be honest... He doesn't even seem that hungry. He has a good meal again at 11am, 3pm, 6:30pm and a dream feed at 11pm. 
So he's eating about 5 times a day with lots of wet diapers and a daily poop. 
I guess I get worried because I see a lot of posts where babies his age are still eating every 2-3 hrs. 
Does this sound ok?