My ds did the exact same thing, he is a very easily distracted little guy!! I retreated to a quiet place in the house, at first I was a little resentful, but it soon became 'our time', and it was a nice break from the other noise in the house! I also fed him as soon as he woke up, I found he ate better and was more relaxed at that time. Everyone told me they eventully do develop a stronger suck, so feeding in 5-10 minutes is not unusual. We fed that way for 4 months, and he still gained weight, so he must've been eating enough. If your lo is still acting hungry, maybe he's not ready for a 4 hour schedule? We fluctuated between 3.5-4 hours for awhile, some weeks it would work just fine, and others he needed to eat more often. I found that time was VERY stressful, I can relate to what you're going through!!