Breastfeeding question

My son has some acid reflux problems. Not bad but if we aren’t careful he would spit up. My question is how long do your babies breastfeed for? I feel like he’s not on for that long maybe 3 to 4 minutes, lets go, my husband would burp him and I would try again on the other boob, baby would not be interested. He would just coo and look up at me hahaha!

So I’m guessing he’s full? Maybe eats again in another hour or two?

Recently he hasn’t been pooping much. Maybe once a day. I wonder what’s up with that.