Do you discard formula after an hour they start drinking it?

Do any of you continue to feed your baby formula longer than an hour after they started feeding from it? I'm just curious. My daughter's 13 months old now and not taking formula anymore, but when she was, I was always strict on once an hour has passed, I dump whatever she didn't finish, since the container said to discard whatever she didn't drink an hour after she starts drinking. How strict is that rule actually? I saw a mom recently feed her baby the same bottle of formula that she fed hours ago. Not judging what others do, I'm just genuinely curious.

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