Q:

how can I know how many time take my google script to run

I have multiples script running into a spreadsheet.  I want to know how many time take the script to finish in sec. 
I needs this information to find a way to tunned these script. 
I know my question is very simple but i don't know How to do ? 

A:

Take a look at the Execution Transcript after running the script.  Click View -- Execution Transcript in your script editor

