You find it empirically: drop a session, hold everything else steady, and watch a full week of totals. Steady totals mean the number is at or below the new count; a slide means you crossed it, so restore the session. Knowing your number turns schedule planning from superstition into engineering.
Log any session in two taps, backdate the ones you forgot, and let the 7-day average chart answer supply questions with real numbers. Every pump files its milk into the stash automatically.
Milk First speaks this whole language for you: seshes logged in two taps, every bag on its correct clock.
Get Milk First free