Warmed breast milk from fridge, baby drank a little, fell asleep and 30ml of bm is leftover. How Long can I keep the bm at room temperature to refeed or the bm has to be discarded?

Best is within an hour else please discard. No doubts heart pain but better than get Yr lo into trouble. Try to feed and 'disturb baby till baby finishes the BMW rather than let it go to waste.