Some days it can be less but you can build up your supply. I was only getting 600ml a day now I’m getting 900-1000ml I upped my pumping so 4-5 pumps a day, at least 30 minutes but if I’m not doing anything at that moment I may go up to 45 mins or an hour. This built my supply up and had kept it steady 😃
Make sure you are drinking lots of fluid, makes a huge difference to your supply, up to 13 cups of water a day and pumping early morning and night time is when your supply will be at its highest, dinner time and evening time you will naturally be producing less milk. Hope that helps x
Pumping every 2/3 hours for 20/30 minutes always does it for me