When babies grow older, they become more efficient at getting milk out from our breasts so the duration will not be longer as what you're expecting. Frequent feeds or not depends on your baby's appetite. If your son is the type that likes to take small meals then he will feed frequently. But dont despair coz they go thru phases and if you meet a difficult phase just press on and it will pass. breast milk is the best for baby so if you can, persevere!