It's not milk though is it? It's some type of tube feeding. Look at the bottle, and then look on the company website.For example, Vital AF, a common tube feed formulation used in my hospital can hang unrefrigerated for 48 hours per the company website.https://www.abbottnutrition.com/our-products/vital-af-1_2-cal
Please forgive my ignorance, this is genuine confusion and not sarcasm or anything like that but I'm really not understanding how anything is relevant behind the time at which formula milk goes bad at room temperature. Whether he's fed 10ml an hour or 1 liter an hour into his stomach or his bowel, the fact would remain that the rate at which milk would spoil at room temperature would be a constant - I'm having difficulty understanding why the answer is not straightforward that 'formula cannot sit unused at room temperature for xyz hours' as an example. Nothing unique to him or his situation would make milk sat at room temperature last longer - at least that I can think of - but if I am being ignorant to something that changes everything then please tell me so I can learn.Right now in my head I'm having trouble getting away from the concept of whether I eat chicken in 2 bites or 17 or whether I put it in a blender or I eat it fried, it would still be unfit for consumption if it were first left out for a period of time. And given that we believe the nurse is doing something we've been told is bad, it wouldn't make sense to ask her because she wouldn't contradict herself. It makes more sense to me to look for a consensus from different professionals.For his feed, that's my bad referring to it as an IV, it's in a bag that hangs up on a pole and is administered slowly over 4 hours at 45ml per hour. We give him 180ml and change the bag every 4 hours. The line runs through a kangaroo thing that pumps it into his bowel through a J port in a button on his chest. Instead of 180ml at 45 per hour for 4 hours the night nurse is feeding him 360ml in the bag over 8 hours at the same rate so just doubling the contents of the bag and leaving the bag at room temperature for 8 hours while it is administered into him