Event definitions futher describe the behavior of an event.
Timer events are events which are triggered by a bpmn:TimerEventDefinition. They can be used as start event, intermediate event or boundary events. Boundary events can be interrupting or not. Timers are configured using an ISO 8601 time format.
Specify how long the timer should run before it's fired. These are specified as ISO 8601 durations.
Example (timer will expire in 4 days):
<bpmn:timerEventDefinition>
<bpmn:timeDuration>P4D</bpmn:timeDuration>
</bpmn:timerEventDefinition>