Some people take longer than others and depends on several variables such as age,
fitness, exersize during tx, stage of liver disease, other medical issues, etc., etc. Just knowing he's done should be of some relief.
It took me several weeks to a month after tx to not feel exhausted most of the time. The second and third month felt progressively better and now near four months, not sure if I'm back to normal yet, but feeling very good. It does take some time, so be patient.