I asked for, and received, a lot of constructive opinion.

I will do the 10 second raytracings to eliminate all those colours
they do not want.
Then, when the client(s) and I narrow it down to a couple, do a better
rendering.
The 3 minute time span will be taken up by reviewing the wonderfulness
of the product, and the excellent choice the customer just made
extolling the virtues of having superb taste.
*hurl in bag/ toss*

Seriously, that was very helpful.

Thanks.

r