Is my baby drinking enough each session?

Cassandra

So my daughter is 1 week old today and I am a FTM. Right now on average my little girl is drinking about 9 to 10 min on first breast and 4 to 5 min on the other breast. She always falls asleep no matter how uncomfortable I make her. I always wait to change her til half way through just to help with the wake process... I play with her neck chest feet hands but no go once I got that 14 to 15 min mark. I try to express to see if she will continue on...no go.. I can say that she tends to have a wet one and dirty with every 3 hr session that we have so I think that means I shouldn't worry but wanted to see what everyone else thinks or if you have any tips. I should also add that she came 3 weeks early at 36 weeks 6 days. So I know they tend to be sleepier at that point.