How many hours per pumping session?

1 month postpartum. I have been doing direct latch + pump + FM. I hate pumping session🤣 to the point now i only pump every 4-5 hours. Is this okay? Though I noted seems there is decrease in supply especially in the afternoon. Noon time 40-70ml both sides Night and morning 90-160 ml both sides Is this normal? Any mummies doing 4-5hours pumping schedule as well? Initially i did 3 hours but i can no longer keep up. #FTM #firstbaby