Imagine those of us who do both.
I hear ya!! When I was breastfeeding and supplementing with formula, each night time feed took approx 1 - 1.5 hrs. Thankfully it was only 2 or 3 times per night, or I would never have gotten any sleep.

I wonder if the study took into account how the breastfeeding was occurring? I was never able to get the knack of bf lying down. For me, night feeds always involved getting out of bed, having to position myself correctly sitting upright before I could bf, so ff was only a minute or two longer (to heat the water in the microwave and add the powder).