I've also struggled to get properly into a Dostoyevsky novel, which irks me because he is so renowned.There great site: LoyalBooks that offers free audiobooks of works outside copyright, all read by volunteers.
It's a great place for classics. In terms of attention span, though, audiobooks do seem to put people (me included) to sleep..... which is ok by me. It just takes quite a while to actually make progress in the story..

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