Breast compression also works well to speed up pumping time (for those of us with little patience). I actually have often found it faster to single pump (with either an electric pump or manual cylinder type pump that you can keep the suction going using one hand) and compress the breast with the other than to double pump. (This also give you one hand free to dial the phone etc) Personal experience related hear. ( I know that you are supposed to release the pressure on pumps to prevent nipple trauma but sometimes speed is of the essence such as when you are not sure when your beeper will next go off)