Without seeing the capx, I'm not sure how you're doing the countdown timer. But here are the elements of a countdown timer.
- Start/Stop boolean. This tells whether the countdown timer is counting down.
- Countdown max time. What is the countdown's maximum time. In your case, it's probably 25 seconds.
- Countdown current time. When the countdown timer is at 'Start', current time is subtracted by delta time per tick.
- Finish condition. Every tick, check if current time is <= 0. If True, then put the countdown timer to 'Stop'. Then reset countdown timer's current time = max time. This is the reset. You also put any other action you need on Finish.