By default, all indicators are available in the report in number of days :

Lead Time Request : this is the approval lead time (Approval date end minus Approval request date).

Lead time transferred date: this is the approval lead time further to a transfer of validation ( Approval date end minus the Approval transferred date).

Lead Time Conditional : if no transfer of validation is done, the Lead Time conditional is equal to the Lead Time request.

Lead time date: 

1) if no transfer of validation is done, then  Approval Date end minus the Approval date start.

2) If transfer of validation : Approval date end minus Approval transferred date