How long can you leave infant formular in a bottle under room temperature?

i am not sure about this, especially when using the avents warmer, i am not sure how lomg i can leave the milk in the warmer ,cos most times when i am ready to use the milk the baby might not be hungry at the time, so what do i do to make sure i am not giving him spoilt milk, cos i make up all my bottles once a day... show more i am not sure about this, especially when using the avents warmer, i am not sure how lomg i can leave the milk in the warmer ,cos most times when i am ready to use the milk the baby might not be hungry at the time, so what do i do to make sure i am not giving him spoilt milk, cos i make up all my bottles once a day and store in the fridge then when i am ready i just bring one bottle out please help
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