'Years' in the Bible

Then the Angel of the Lord said, “O Lord of hosts, how long will You withhold mercy and compassion from Jerusalem and the cities of Judah, against which You have had indignation and anger these seventy years [of the Babylonian captivity]?”

speaking to the priests who belong to the house of the Lord of hosts and to the prophets, saying, “[Now that I am returned from exile] shall I weep in the fifth month [mourning the destruction of the temple], and fast as I have done these many years [in Babylon]?”

“Speak to all the people of the land and to the priests, saying, ‘When you fasted and mourned in the fifth and seventh months these seventy years [that you were in exile], was it actually for Me that you fasted?