When you receive timed breakers (boosters) in the game, once you claim this time, it will continue to countdown even when you're not playing the game.

For example, if you got 1 hour of timed breakers and played for 30 minutes and then did not play again for another 20, you would have 10 minutes of timed breakers remaining, and not 30.

Please note that this also applies to time for unlimited lives, as well.