That's how I've done it when it did not work. I did, however, go easier, one by one. I first made a simple countdown. Then I made it count down from 10 minutes to 0. Then I created 2 of them. Then I put them side by side. Then I did the logic, one counterstarting each other. Every step of the way, it was filled with loads of errors and loops out of which the ai couldnt get out, to the point where I would need to go there and fix it myself. Errors ranged from logical, to super simple syntax issues, such as missing colons, or brackets.