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Hello @auneless being able to pause a timed booster, or timed boosters only counting down when your game is active is a hugely popular idea and is something that has been asked for by players over and over again. Because pausing timed boosters has been asked for before this makes your idea a duplicate and I am sorry to say duplicate ideas aren't allowed. The best thing to do is to add your vote to an existing idea.
Here is a link to a previous idea