You should be able to find timers by using the search for unknown value. Usual timers like time-based bonuses are kept as a counting-down timer. The rest of the timers, such as on-screen timers, are stored as counting-up timers. This says you have to search for both types of timers when you want to change time-related things. Moreover, timer values also can be kept in various ways. Time can be stored in one address or two addresses. It depends on the game that you are playing.