me.... ages i tried and tried i guess my flow from a manual pump was not so good. I got 1 oz after maybe an half an hr.
Im not sure about electrics thou i guess it comes down to your milk flow when you pump some woman can get smurf loads but myself could hardly get any
I can't speak to manual pumps but I have a Medela Pump In Style and after my milk came in, I could get ~5oz off the breast my son wasn't feeding from. You can rent them from the hospital as well and those ones are even more heavy-duty.