There are multiple correct and natural choices.
... in the last 6 months
... over the last 6 months
... during the last 6 months
... for the last six months
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I would prefer to say something like that for this case:
I haven't read a book for 6 months, I need to catch up on reading.
8 mars 2021
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Over the last 6 months is correct🌷
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First phrase is good. Not the second
8 mars 2021
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