[2023] Why my booster is missing after I quit the game?

Originally posted by Wabbajack: Ah I see, I thought it didn't limited by how many games/mission I played and will last for 24 hours. Thanks!!

Boosters got time limit and use limit.
After you activate it, it will least for 24h or specific number of battles (depends what ends first).
If you see, that your not active booster will soon expire (for example, in 3h) and you do not have plans to play for next, lets say 10h, you can still activate it. When you activate it, you will have that 24h to use it (that uses will be counted from first battle you start after activation, so you can, for example go to sleep and continue to play next day with active booster).