So my son is 3 months old and the most he breast feeds at a time is 5-6 minutes, then he falls asleep or unlatches. And he’ll feed every hour or hour and a half. He’s been gaining weight, has plenty of wet diapers and poop diapers every other day, and after eating he seems content and doesn’t really cry unless he’s super tired. But I’m just worried and concerned he’s not getting the hind milk.
The beauty of breastfeeding is that it’s a pretty self-regulating process and that mother and baby adapt to each other quickly.
Speaking from experience, I had two very different babies. One would leisurely feed for half an hour (slowly but constantly, clearly enjoying the time), the other was done in just a few minutes. She still has a rather no-nonsense attitude towards food, she eats to live while the other lives to eat, as they say.
As long as your child is growing fine, seems content and satiated and is filling his diapers, I can only recommend to stop worrying.
As for the hind milk, it’s possible that you baby is just thirsty (e.g. in hot weather or climate, when they are prone to asking for frequent quick sips), but I think it’s more likely that your body has adjusted to your baby well enough that he gets what he needs.