You can limit the amount of time an entity spends during the simulation on designated entity paths. Exceeding the limit causes a timeout event and the entity is said to have timed out. The duration of the time limit is called the timeout interval.
You might use timeout events to
Model a protocol that explicitly calls for timeouts.
Implement special routing or other handling of entities that exceed a time limit.
Model entities that represent something perishable.
Identify blocks in which entities wait too long.