That's right, mine was on the boob every hour or 2 through the day and I was told this was way too much but she slept 12 hours overnight so I figured the same as you did that she must have just been making up for it.  She only had 12 hours to fit in what other babies take over 24 hours so of course she would be taking more.  If babies are healthy, active, weeing and pooing as normal, bright and happy then you are doing right.  If he doesn't finish a feed I wouldn't force it, but just take note of what he's leaving if you can.  If he's unsettled and has a feed and becomes settled, then a feed is what he needed.