How long can freshly expressed breastmilk stay outside before storing in chiller given our weather in Singapore?

Normally I will only let it sit for a maximum of 1-2 hours outside and about 3 hours in aircon before putting into the freezer. It will be safer to chill it immediately unless baby is waking up in 1-2 hours for the feed. The weather is really hot right now so it is difficult to gauge exactly how long the milk can stay out.

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The most I will let it sit 1her outside as Singapore weather is so humid

at the most 1 hour. I'm too scared to risk giving baby spoiled milk.

3-4 hours in aircon is ok in my opinion. Without aircon, max 1 hour