isaacaustin
Post 1287
The context of Jeremiah 25 indicates that the desolation and servitude would beof a duration of seventy years. Plain and simple. Jeremiah describes the fact of the land being desolated, the domination of Judah by Babylon and the taking of Exiles, these events were fulfilled within the seventy years period as this is the only time reference that he describes. Josephus describes the situation in some detail and he agrees with this understanding of the seventy year period as traditionally presented by the 'celebrated WT scholars.
Your 609-539 BCE hypothesis does not work because the beginning date is too fuzzy and the end date finds the Jews still in Babylon as exiles serving the current king of Babylon. It does not work.
scholar JW