Components
Lead Time
The amount of time between the joiner hire notification time and the joiner start time.
Cf. Joiner Lead Time (Dictionary Entry).
Completed (non-cancelled) instance
A process instance that has been completed but not cancelled (i.e. the joiner effectively joined the organization).
Joiner Process
Cf. Joiner Process (Process - IAM).
Period
The period being analyzed, depends on the indicator reporting frequency but typically monthly or weekly.