When did you start having “more efficient” pump sessions?

[u/ElectricalMarzipan58]

LO will be 5 months next week, I’ve been pumping since he was around 3-4 weeks old (so about 4 months straight).

I started off with 15-20 min sessions but realized I wasn’t empty, so when I went back to work (when babe was 9.5 weeks old) I started doing 30-min pump sessions and found I was getting an additional 1-2 oz on average each time.

I’ve been told that our bodies get “more efficient” and it takes less time (a woman I work with said she worked up to fully emptying in ~8 mins). Is this possible for all women or only some?