Question!

So I’m a FTM as of the 19th , and we’ve been breastfeeding . She’s got a great latch and seems to get full every time as she falls asleep shortly after eating or just becomes really content and happy. But I’ve noticed today and last night she’s eating for shorter period of time before falling asleep, like 5-10 minutes. Is that normal? My milk is coming in so I know she’s getting more than before , and when she’s done she’s got some on her little face . But is it normal for her feedings to be shorter? She feeds every hour or two as she’s only 5 lbs .