How long is a bottle still good for?

Christy

I am formula feeding (pumped the first 6 weeks). My little one typically eats 4 ounces but has a habit of drinking 1 or 3 then falling asleep, waking shortly after then wanting to finish her bottle. I haven't been able to find a clear answer. Some articles i have read have said to throw out immediately but others say an hour, or 30 minutes. Anyone have any guidelines for me?