How do I time reaction into the game

Good morning to all

I have within my therapeutic project I want to calculate the reaction time that a person takes to destroy an object (arrow) between destruction and destruction, and that it goes out once after another and I want to calculate said time.

I have a global variable called total time, with the function For every 1s add 1 to said variable.

I have a global variable called destruction time, which is set to destroy the object for every 1 s add 1 to that variable.

For Time 1 it would be T reaction total time - destruction time and we add it to another variable, but I want it to always calculate it and this is where I am lost.

Thanks in advance.

I'm not quite sure I understand your question, but it seems like the timer behavior and it's expressions should have everything you need.

construct.net/en/make-games/manuals/construct-3/behavior-reference/timer

i see; i try to find this information

Thanks a lot