How long can we keep the unfinished breastmilk

Hello mummies! My baby is drinking 100ml nowadays but doesn’t always finish all the milk and sometimes left quite a lot. How long can we keep the leftover in room temperature? Can we put back in the warmer until the next feed? If let’s say i put 100ml in the warmer at 12am and she only wakes up about 1am to drink. Drinks about 30ml. Can i put back to the warmer and feed her on her next feeding? Sometimes she wakes up like 3-4am. Is it ok?

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if haven't been drink can put for 2-4 hours, but if already drink half, I only put up to 1 hour as it's already contaminated. maybe u split into smaller amount if u think he/she won't be able to finish it all