Makes sense. If you didn't believe in ghosts before, it's not going to be your first explanation. [Still, there is one way to figure it out.] Do you know who the ghosts are? If they're haunting you specifically...
[Well, if someone close to him died, or if he had unfinished business with someone dead, that would be the easiest way to figure out how long it had been.]
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[Well, if someone close to him died, or if he had unfinished business with someone dead, that would be the easiest way to figure out how long it had been.]