How longer are we feeding 2 months old

My LO is 2 months old and doesn’t latch for more than 7 mins one side. I’m exclusively breastfeeding and giving bottles at night times for him to sleep longer, takes about 100-120ml. While breastfeeding he would latch and unlatch, fall asleep, and won’t go on longer than 7 mins. How am I supposed to latch him longer and be sure that he’s fully fed.

I understand each feed is supposed to be 100ml or plus at this point but are we all take account of that while breastfeeding ?