Click mouse every 60 secs. for 3 hrs

You’re welcome. One other thing: do you really want to tie up your Mac for 3 hours because every 60 seconds KM is going to try to take control of your mouse? If you are trying to use your Mac at the same time the macro may not be able to click in the right place and equally the macro might spoil what you’re trying to do - every 60 secs for 3 hours!!