How long does your baby take to feed off a bottle?

We're doing paced feeding (slow flow teat, side lying on our lap or sitting upright, bottle at 90 degrees parallel to the floor, dropping the bottle when baby takes a break from sucking, stopping half way to wind) and it takes 15- 20 mins. Baby is nearly 5 weeks and gets one bottle a day breastfed otherwise.

I'm trying to pace feed coz she drinks it so fast and then doesn't realise she's full, end up making more milk and the she ends up sick 🙈

Ours naturally takes nearly half hour but she does like 3 seconds sucking then 3 pausing