Please help me understand!

An

So confused about breast milk storage and use rules! A LC told me milk is ok at room temp for 6 hours, is that correct?

If I take some out of fridge and my son doesn't finish it all, I can't put it back in the fridge???

Can I pump my left breast now and my right breast in about 30 min and put it in the same bottle that I used for my left??

I hope my questions make sense but please help 🤦🏼‍♀️