I had an all day work conference today so I had to express at 11.30am. I put the EBM in a zip lock bag inside the bag that the breastpump came in, so it was at room temperature. About 2 hours later I put a cold water bottle next to it at the advice of a colleague as I didn't have access to a fridge to store it. I didn't get home until close to 6 oclock, when I put it in the fridge. Do you think I can still use the milk or should I ditch it to be on the safe side? I'm not entirely sure how long you can store it at room temperature..? TIA.