Just wondering how you all tried to avoid wasting breastmilk when experimenting with bottles and bottle refusal? How long would you try to feed a baby from the same bottle? Did warmed vs. cold milk affect your "acceptable" timeframe?

I've been dumping out the (warmed) milk after an hour of offering, but I hate wasting it. It's only been like maybe 10-14 oz culmulative so far, but hey, I made that with my body! My LO is 7 weeks old and seemingly takes 3 oz for full feeding. We started off with 3 oz back when he was ok with a bottle, then he started to refuse about a week ago so we decreased to 2oz servings, and now we are down to 1oz offerings! So many bottles to clean.