Pumping breast milk

How much breast milk do you all manage to pump out per session? And how long does it take? I seem to be able to pump out only 30ml for both breasts and it takes about ½ hour. It’s so frustrating. I don’t know what I’m doing wrong. I’m using the Spectra M1. It doesn’t seem to be pumping out much. Most of the milk comes from me compressing my breasts. My baby is 4 weeks old fyi.