How can i measure time not clicked in my game? [closed]

Hi, I'm working on my game at the moment and I'm trying to make a combat system. I am trying to make it that the player goes into combat idle when punched and after x amount of time he goes back to his normal idle. I cant use a for I loop cause every time I punch the timer should restart I tried using os. clock but that won't work either does anyone has an idea?