The online references feature has several dynamic settings that allow you to control:
The minimum number of valid references required from an applicant/member
The number of days a reference is valid for
How, when and what notifications are set to referees
Mapping of referee feedback as documents against a profile
Notification message applicants view when submitting referee details
To access the referee settings please click Masters > Referee Settings
From here the referee settings screen will appear.
For further information on each field please refer to the below image.