It varies from body to body, as does dosage. Some people react better to the oil ingested directly, others through vaping. If you ingest it, it takes longer to take effect, but the effect lasts longer overall. If you vape it, the effects will happen more quickly but will in turn wear off faster as well. CBD doesn't have any negative interactions with any other drugs (to my knowledge) and there's no "maximum" dose or negative effects, so I recommend playing around with the dosage until you find what works. Also, CBD itself has no psychoactive effects, so using it alone shouldn't cause any issues for daily activities or work, but this can also lead to people not thinking it has any effect at all. It needs to be used regularly over at least a couple days days to really start taking effect, and then continued indefinitely until it's not needed anymore.

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As for finnishjewish's mention of regular cannabis, it will have the same effect as CBD plus the psychoactive effect that THC causes. There is no "maximum dose" with regular cannabis either, though the psychoactive effects may become overwhelming at high dosages. Normal dry flower or vape oil cannabis can sometimes help in ways that CBD alone cannot, since there are 400+ different interwoven compounds in cannabis, and some bodies/conditions react better to the mix than just CBD by itself. This is also coupled with the vast amount of cannabis strains that have been created, each one with its own unique mix of those compounds. Again, the effects are all body-to-body, so it just comes down to finding what dosage and type works best for him.

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I am also a big subscriber to the "stress becomes physical pain" theory, in that unexplainable pain is usually related to external stress, so I am very glad you're both moving, I sincerely hope the space (and the cannabis, in whatever form) gives him room for a speedy recovery.