How long does it take your baby to finish bottle?

Curious how long it’s taking everyone’s baby to finish a bottle. Typically it takes my daughter 25-30 mins to finish 4 oz. I’m going back and forth on wether or not i need to change her nipple. Just feel like 2 months is too young for medium flow. She doesn’t act like it’s too slow for her. She hasn’t been finishing her bottles but I can’t tell if it’s because she’s tired of sucking or if she’s actually done since I switched bottles and now she’s not leaking half of it onto her clothes.