[quote="malphono, post:3, topic:347119"]
It all depends.
Sometimes a bishop's retirement (or resignation) is not accepted by Rome, so he automatically gets another year (unless he insists on leaving for personal reasons). That can go on for a while, as was the case, for example, with Cardinal O'Connor in New York, who ultimately passed away in office at age 80.
Other times, a bishop's retirement (or resignation) will be accepted "nunc pro tunc" ("now for then") meaning that he stays until a successor is named and then remains as administrator until his successor in installed.
In some cases, a co-adjutor would have already been named, meaning that the co-adjutor automatically assumes the See upon the retirement (or resignation) of the local bishop. This was what happened in Los Angeles in 2010 when Abp Velasco was named co-adjutor to succeed Mahoney.
In other cases, a bishop's retirement (or resignation) is accepted immediately by Rome. In such a situation, the See is vacant, and an administrator is named to run the day-to-day operation until a successor is actually named.
Perhaps I'm missing one or two scenarios, but the point is that there's no hard-and-fast rule.
This pretty much sums it up!!! :thumbsup:
Here in my diocese, our Bishop of 33+ years turned 75 in July 2012. His resignation was accepted in September 2013 and an Apostolic Administrator was named (the Bishop of a neighboring diocese). Our new Ordinary was just named about a month ago and will be consecrated on January 3, 2014.