Plenary Indulgence = Good Time

 Good Time in prison parlance:

A: Good time credit is earned for “good behavior” described in law as “exemplary compliance with institutional disciplinary regulations.” Good time credit reduces a prisoner’s actual time in Bureau of Prisons (BOP) custody. This time off is also called “good conduct time.” The law governing good time can be found at 18 U.S.C. § 3624(b).  

Plenary Indulgence in church parlance:

A: Definition of plenary indulgence

: a remission of the temporal punishment for sin

That's the way my "cloistered brothers" understand it.  Anyway, my prayer partner and I pray the Rosary every day at 6:00PM and according to Pope Francis declaration we qualify for the plenary indulgence.

–       The recitation of the Holy Rosary in families and among engaged couples is another way of obtaining indulgences, in order that “all Christian families may be stimulated to recreate the same atmosphere of intimate communion, love and prayer that was in the Holy Family.”