Reheating cows milk

Currently transitioning lo to cows milk from formula and have a question about reheating. Let's say I warm some milk up in a bottle and she drinks half. Can I put the remainder back in the fridge and then reheat it again later on or can it only be warmed once? Are there time recommendations around this. I know with formula it could only be warmed once and then tossed after an hour but not familiar about cows milk. *should also note that I live in Canada and milk already comes and must remain refrigerated*