'Years' in the Bible

The words of Amos, who was among the herdmen of Tekoa, which he saw concerning Israel in the days of Uzziah king of Judah, and in the days of Jeroboam the son of Joash king of Israel, two years before the earthquake.

Also I brought you up from the land of Egypt, and led you forty years through the wilderness, to possess the land of the Amorite.

Come to Bethel, and transgress; at Gilgal multiply transgression; and bring your sacrifices every morning, and your tithes after three years:

Have ye offered unto me sacrifices and offerings in the wilderness forty years, O house of Israel?