I don't think they would be warm enough just left outside but I'm not positive. Rotate them at least 3x a day or more but always am odd number.
Why do you say it has to be an odd number?
3Xs is the only odd number that keeps things even.
After that even numbers work better.
3Xs every 8 hours
4Xs every 6 hours
6Xs every 4 hours.
 

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