It's a GAM Security Policy property used to specify the minimum time in minutes that a user has to wait until he can change his password again.
GAMExampleEntrySecurityPolicy web panel (located in GAM Example folder) is an example where this property is used programatically. The way to use it in GeneXus code (by using the GAM API) is the following:
&SecurityPolicy.MinimumTimeToChangePasswords = &MinimumTimeToChangePasswords
GAM Repository features and properties