How long Babylonian Exile what ended it

The Babylonian Exile (or Babylonian Captivity) lasted for approximately 

50 to 70 years, depending on whether it is calculated from the first major deportation (597 BCE) or the final destruction of Jerusalem (586 BCE). The exile ended in 538 BCE when Cyrus the Great, the founder of the Persian Empire, conquered Babylon and allowed the Jewish people to return to their homeland. 

Key Details of the Babylonian Exile:

• Duration: While often referred to as a "70-year" exile in biblical prophecy (Jeremiah), the physical removal of the population occurred in stages (605, 597, and 587/586 BCE). The most common scholarly timeframe for the full cessation of life in Judah is 586–538 BCE (roughly 48-50 years), though it is often considered a 70-year period of Babylonian dominance.
• The Cause: The Kingdom of Judah was conquered by King Nebuchadnezzar II of Babylon, who destroyed Jerusalem and the First Temple.
• The End: In 539 BCE, Persia conquered the Neo-Babylonian Empire. In 538 BCE, Cyrus the Great issued a decree allowing the Jews to return to Jerusalem and rebuild their Temple.
• Post-Exile: Many Jews returned, but a significant community remained in Babylon, marking the start of the Jewish Diaspora. 

Note: In the context of the game Arknights, "Babel" refers to a different organization that disbanded in 1098 after the death of Theresa, as indicated by in-game lore. The above answer pertains to the historical Babylonian Exile.