'Years' in the Bible

Moreover from the time that I was appointed to be their governor in the land of Judah, from the twentieth year even unto the two and thirtieth year of Artaxerxes the king, that is, twelve years, I and my brethren have not eaten the bread of the governor.

Yea, forty years didst thou sustain them in the wilderness, so that they lacked nothing; their clothes waxed not old, and their feet swelled not.

Yet many years didst thou forbear them, and testifiedst against them by thy spirit in thy prophets: yet would they not give ear: therefore gavest thou them into the hand of the people of the lands.