Create timer to check running time for "Master" macro

Hell0! I hope anyone can help me with the following problem:
How do I create a timer in a master macro? I got total 21 macros in one Master and I want to check the duration time for the whole master to finish.

I appreciate any help.

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Thank you so much! I tried to create the macro, then set in first in my "Master" macro, but got an error; "timer needs to be a function".

The sample code I posted works - so any issues are on your side. However, without seeing your code it's a pure guessing game...