'Years' in the Bible

The following is a record of what Amos prophesied. He was one of the herdsmen from Tekoa. These prophecies about Israel were revealed to him during the time of King Uzziah of Judah and King Jeroboam son of Joash of Israel, two years before the earthquake.

I brought you up from the land of Egypt; I led you through the wilderness for forty years so you could take the Amorites' land as your own.

You did not bring me sacrifices and grain offerings during the forty years you spent in the wilderness, family of Israel.