How much breastmilk on average does your baby drink after 6 months daily?? I'm pumping and saving…

How much breastmilk on average does your baby drink after 6 months daily?? I'm pumping and saving because I plan to actually quit nursing and just bottle feed breast milk after 6 months. And I'm trying to figure out how much milk I need to save. I've been getting between 16-20oz of milk pumped a day... and I've been pumping for 6 weeks.