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?

Reckon it's only good for 1 to 2 hours before you gotta throw it away. I wouldn't trust reheated milk to last long. Since you can't keep the milk in the fridge again, no point having it out for too long.