If a function runs, it is my understanding that it is kept in a warm state for a period of 10-15 minutes or so to reduce cold starts.
Is this extra time where it is kept warm charged for?
>Solution :
In the default configuration you are only charged for the execution time of your Cloud Functions (and the memory used during that time).
If you configure a minimum number of instances, you will also be charged (at a lower rate, called idle time) for instances that are kept warm for you.