My baby is almost 9 months now and I'm exclusively pumping because she failed to latch since she was a few weeks old.
Before returning to work I pumped every 3hrs, so 8 times per day, total output around 1000ml per day.
Still had to supplement 1 meal of formula.
I returned to work when baby was 3 months, n I started pumping every 6hrs, so 4 times a day. Still around 1000ml per day.
Starting baby was 4 months old she didn't need anymore formulae and exclusively breastfed!
I think power pumping really helped me increase my output
Once baby gets to around 5-6 months with solids being introduced, then she eats 1 to 2 less milk meals n much less pressure on output! Add oil!! I'm still pumping hard every 6 hrs despite sometimes working 24hr shifts!