Using this method is easy but the cat can re-trigger the automation, it just wont run because in ‘single’ mode only one instance of the card is allowed to run at a time. It will put a warning in the log that the automation is already running (really this should be at the info level IMO).
There is a more complex way of adding a condition to check the last time the automation ran. See here for an example:
It’s how I used to do it. Now I just use the dely method.