How many generations does speciation take?

pinksasquatch writes:One mutation can result in reproductive incompatibility. I gave examples.

brad writes: am using the standard 10^-5 muts per gen ordered by symmetrical affects subject to "If any two molecules approach each other, there comes into importance within certain distances the attractive interaction, which is designated by London as teh dispersion force. The motion of the electrons in one of these molecules modifies that of the electrons in the other, so that they tend on the average to move in phase. This produces an atractive force proportional to the inverse seventh power of the distance between the molecules. It has been suggested that this force may be agent in the process of adsorption. This interaction is additive, and of sufficient influence to account in part for the cohesive forces in liquids.