how long can I keep expressed BM for after warming up

I'd usually warmed up my BM from the fridge for my LO. If he does not finish the BM, can I still keep it in room temperature to mix it with the next batch of warmed-up-BM for his next feed in 3-4h?

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Super Mom

If baby’s drunk from it, probably about 1-2 hrs (but still smell it before feeding). Wouldn’t mix it with the next batch