Or it may be exactly zero if the person with the relevant abilities can't be "Deeply committed to AI risk reduction" now because the risk is sufficiently low or there's no means of reducing it, or what you consider "AI risk reduction" doesn't reduce the risk to mankind, or the like (and abilities make that person see this straight). I would expect such good team - if the effort is at all useful, and when the effort is at all useful - to be started by some genius that had a lot of inventions by age 20, maybe 25 at most.