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Back in reality there isn’t a single scripture that even mentions 70 years of exile.
The Bible says 70 years was a period of all the nations serving Babylon, that nations could avoid exile by serving Babylon willingly, that Babylon was called to account when 70 years ended, that 70 years ended when Persia began to reign, and that attention was given to the Jews’ return after the 70 years ended.
But JWs don’t really care what the Bible actually says.