Pump every 2-3 hours for about 30 minutes.

Honestly the biggest thing to keep your supply up is hydration. I would assume you’d want to nurse or pump everything couple of hours. If you’re pumping or nursing your body will make more.

Oatmeal with black strap molasses really increased my supply. Also drinking a lot of water.

I exclusively pumped and in the beginning to get my supply started I pumped every 2 hours for at least 30 minutes(I set my alarm for every 2 hours even during the night) I also needed strong suction so I never pumped both of my breasts at the same time.

Later when I established my supply I pumped every 3 hours for the first 4 months and then I pumped every 4 hours for at least 30 minutes.

All I did was eat oatmeal for breakfast and drink water (only water unless I was having a glass of wine) and that kept my supply up. As far as pumping. I pumping for like ten minutes on each breast after every feeding to help build my supply