They had DS's second bottle warmed up and just sitting there when I picked him up today (he refused all bottles today). It's a full six ounces. It was pumped milk from yesterday that was warmed up probably around 3:30.
I dont even know if there's any point to keeping it, but DH thinks maybe he could give it overnight so that I can sleep...
Re: How long can I keep this milk?
I think it'd be fine to use tonight. Kellymom says that BM can be used for one more feeding.
https://www.kellymom.com/bf/pumping/reusing-expressedmilk.html