Breastfeeding at night

Emily
How long do your babes feed at night?
My babes about 5.5 weeks old. He used to feed for 15-20 min on one breast. Now it seems like it's 6-10. Then he's pulling off.
We did start a bedtime routine where we feed, then diaper then story then bed. This way he falls asleep on his own vs just suckling on me to fall asleep. I'm wondering if this is why he doesn't feed as long?
Also he's been sleeping stretches of 4-6 hrs after his bedtime feed.