When you have put the time in and money for boosters etc, there should be no time limit on the boosters. That seems redundant. I as the player, have achieved the amount needed for a booster or I have paid for the booster. None of what you earned or bought should be on a time limit. That’s not fair to then have only so long to use what we earned.
also when I have purchased the points needed to complete a level, if I don’t use all of the steps, they should be put into a reserve.