Time served is also a term used to indicate a craftsman has spent the required period as an apprentice.
Famous quotes containing the words time and/or served:
“Take not God’s name in vain; select
A time when it will have effect.”
—Ambrose Bierce (1842–1914)
“It will not be so among you; but whoever wishes to be great among you must be your servant, and whoever wishes to be first among you must be your slave; just as the Son of Man came not to be served but to serve, and to give his life a ransom for many.”
—Bible: New Testament, Matthew 20:26-28.