Hi mama! Para sa ganitong specific questions about medicine shelf-life after mixing, kailangan mo talaga tanungin ang pharmacist or read the package insert, bawat brand may different instructions, kaya better safe than sorry with baby's hydration!
A few of us mums usually prepare fresh batches every few hours lang para sigurado, pero the exact timing talaga ay nakadepende sa product. Check the box or ask your pedia, okay? You're doing great asking first!