I've got a short easy-to-understand piece on half-lives coming to S.com later this week, which will be an expansion of my sig's rather clear explanation of the concept.
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Caber's average half-life is considered to be approximately 60 hrs, or 2.5 days, thus with 8-9 half-lives prior to the terminal one, you end up with around 22 days/ approx. 3wks of actual caber activity in your body.
Adjusting the average half-life (usually off) to accommodate the government study results below, which rates half-life between 63-109 hrs, and using the upper limit, you get --- 109 (hrs) / 24 hrs (1 day) = 4.54 (days per half-life) x 9 (half-lives) = 40.875 (days) / 7 (one week) = 5.84 (weeks) or an upper limit commensurate to that of your own estimated 4-6 wks...CONFIRMED!
http://www.ncbi.nlm.nih.gov/pubmed/12844325