They date from the time of the legal expiry of each mans cornptilsory active service.
It contemplates the assumption of the vow for a limited period only, and gives particular details as to the atoning ceremonies at the sanctuary by which the vow must be recommenced if broken by accidental defilement, and the closing sacrifice, at which the Nazarite on the expiry of his vow cuts off his hair and burns it on the altar, thus returning to ordinary life.
At the expiry of the one year's truce which followed the treaty of Peronne, the king accused Charles of treason, cited him to appear before the parlement, and seized some of the towns on the Somme (1471).
Where there is joint authorship, copyright expiry is based on the last author to die.
With statin patents approaching expiry it could be some time before we know the answer.