Re: Efficient or lazy nurser?
Best way to judge hindmilk intake is by poop color: if baby's poops are consistently yellow (the color of cheap mustard), he's getting plenty of hindmilk. If they are consistently green, then he may be getting an overabundance of watery, lactose-rich foremilk.
It sounds like nursing is going very nicely. Baby is gaining, having plenty of diaper output, and your supply is no longer wildly out of tune with his needs. I wouldn't worry about the fast feedings at all. Some babies become very efficient feeders early on, spending just 5-10 minutes at the breast. This is often the case with babies whose moms have large milk supplies, because the milk is so easy to get out! So don't watch the clock, watch the baby. He seems satisfied after feedings because he is satisfied.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"