Eating/comfort

My baby has taken to breastfeeding really well since day 1, we have lots of wet diapers a day and a few poopy ones. I’m just curious how long I should leave her on for a feeding... she hardly ever just lets herself off unless she is completely heavily passed out. If I leave her she can stay on for 30 minutes or more until she’s sort of sleeping and I slowly pull her off to attempt to put her down. I just don’t want it to become a constant comfort thing, but don’t want to pull her off too soon etc. what’s your experience?

She nurses pretty often every 1-2 hour and she’s 2 weeks.

Thanks!