Using boosters

Hi there, welcome to the Community.

I want to let you know that timed boosters in the game can not be paused or saved to be used at a different time. Once you claim your timed boosters, their timer starts and it's counted in real time.
If you close your game, the timer does not stop so whenever you obtain those, it's best to try and pass as many levels as you can with their usage.

I hope this helps and have a nice day.