Formula milk shelf life

Hi! How long do you throw away your excess formula milk powder once opened? I’m using Similac and the instructions says to consume within 3 weeks of opening.. which is quite fast. Google seems to suggest 1 month. Thanks!

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Please finish by 3 weeks or discard. Germs can grow quickly in Singapore warm climate, especially in highly nutritious items like formula powder, babies can get very sick from contamination.