The Timer Intermediate Event adds time-based dependencies within a process and is either inserted into the sequence flow to create a delay or attached to an activity to create a deadline or "time-out" condition.
When a token (process instance) arrives at this Event, the clock starts, and the token waits for the specified time-related condition to occur.
Note: In order to see the Timer Events reflected in your inbox, you must run a program that checks and executes these events. See Timer Control for more information.
Timer Start Event in BPD