From the Saga I Rulebook:

States: Some characters can put themselves or others into different States, which may cause advantages or disadvantages. To indicate that a character is in a State, put a number of State counters on its card equal to the level of the State. For example, a character affected by a level 2 Haste spell will have two Haste counters on it. State effects don’t last forever: remove one counter of each type of State during Maintenance phase. When no counters for a specific State are left on a character’s card, the character is no longer under the effect of that State.