I have a question about breast feeding . Kai only feeds off each breast for a very short time,…

I have a question about breast feeding . Kai only feeds off each breast for a very short time, sometimes he'll drink for 30 minutes on one breast and way less on the he other but majority of the time it's way less on both . Does that matter when it comes to my milk supply ? , Reguardless of how long he stays on my breast , as long as I breast feed him often , it will increase right ? I know it's a silly question but I'm still learning .😃