Quoting dream:" that's fine and normal. I actually had to cut down to 3 min at one point because he was spitting up so much and getting "overfull"."
Quoting Love Wedge +2:" How do you do that without them screaming because they're still hungry?"
I would time him for 3 minutes, then pop the paci in. If he spit it out or wanted more, I'd nurse a little longer, but usually he was fine with 3 minutes. I didn't do this for EVERY nursing session, but for most of them during that time (3-6m old ??) He ate quite often though, about every hour.