FWIW, most pharma patents are short lived. The IP gets filed while the drug is still in development, is often granted before clinical trials start, so by the ti

FWIW, most pharma patents are short lived. The IP gets filed while the drug is still in development, is often granted before clinical trials start, so by the time the drug goes to market a decade or more might have gone by in what is a 17-year period of exclusivity. So not far off your hypothetical 6 year period.