Surely you mean 'your'? It basically means that the timespan he thinks his wife has been away does not have to be equal to the actual time. It makes perfect sense and is correct -- assumed you replace "you're" with 'your'.
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alc24I could help but notice a couple of mistakes in your sentence and thought I'd tell you.
It basically means that the timespan he thinks his wife has been awaydoes not have to beisn't equal to the actual time. It makes perfect sense and is correct -- assuming you replace "you're" with 'your'.
Timespan doesn't exist but I