Is pumping suppossed to hurt?

Hi guys...I just want to compare experiences. O exclusively breastfeed but I dont latch,bO just tranfer and bottle feed. Anyways...I normally always pump 10 to 15 mins MAX. I heard about power pumping or how some people can even pimp for 40 mins to an hour... I can say I honestly cant. Beyong 15 mins, my nipple is already very sore and sensitive and my back alreadh starts to hurt...