Robert Kesterson wrote:
>
> I doubt the apes, or even early man, took much notice of the effect of 
> a food beyond a day or two after eating it.  Something you eat today 
> affecting you 20 years from now would not have even entered his brain.
>
It takes from 30 minutes to three days, depending on what kind of poison 
it is.
Easily quick enough to noticably hinder food-gathering abilities.

William