Firstly create a variable (can call it anything, but I called it buytimer) and make it's type a timer.
Events Map initialization Conditions Actions Countdown Timer - Start buytimer as a One-shot timer that will expire in 15.00 seconds Wait 1.00 seconds Countdown Timer - Create a timer window for (Last started timer) with title Buy Wait 14.00 seconds Countdown Timer - Destroy (Last created timer window)