Time Machine : incredible calculation time required

I have started backing up with Time Machine and this is an example of what it gives .
In the beggining it calculated 6.000 days and after thirty minutes or so , it got to that conclusion .
I have done the full reset of Time Machine and restarted the procedure but nothing changed .
Currently , it needs 654 days .
It doesn't seem to make any progress.
What is the deal here?
Shall I leave it or does it need fixing ?
Thank you and have a great weekend.

Ok, now it has reduced the time in eight hours and it's progressing .

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=====================================================
Fading out. " ... J. Arthur Rank on gong."

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