first time pumper..

Elizabeth
I was never ever able to pump enough with my LB but with my LG I got quite a bit out.
But I have a question. When bottle feeding breast milk, how much would be enough? 
I'm going to try and pump out as much as I can and store it for my SO to feed our little girl over night or if my mother has her for a few hours. I'm just scared incase they don't have enough milk. How much would you give them?