The days of updating the default tombstone lifetime for Active Directory may be long forgotten, but if your Active Directory Forest has been running since Windows Server 2000/2003 and you have never verified the tombstone lifetime, it may be worthwhile to do so. As I have found first-hand with my customer, there are some deployments out there that may still be using a tombstone lifetime of 60 days. Expecting a value of 180 days and realizing too late that this is not the case may cause unnecessary complications in the future.