Breastfeeding question

Ji
Ok I'm confused! I am bfing and pumping every two hours but it takes me literally the entire two hours to get it all done. I bf for a half hour... then after I supplement feed my baby girl it's been about a half hour so I pump for a half hour and then in a half hour I'm suppose to nurse again?! My supply has no time to refill! Can someone help me figure out how I can manage this better. She said all in all each feed should take no longer than 40 mins but with 2 kids and eating and supplementing and everything else it feels impossible! But my boobs have no time to refill so what the heck!! TIA