Let me first state that I will not besmirch the name of several fine artists with a "Who is the slowest tattooer?" thread. Instead, let's discuss the fastest of the fast. I'll try to limit this to personal experience, but feel free to mention lightning-fast artists you've witnessed, too.
Our very own Scott Sylvia inspired this thread. I was at Forever Tattoo in Sacramento over the weekend and Ian Carder showed me the Rock of Ages backpiece that Scott put on him. He said it took about 15 hours. I guess I should stop being surprised at this point, but damn.
Horitaka is also really fast. I have a black and gray falcon from him that takes up most of my shin. It took him an hour.
Theo Mindell put a huge dragon head on my knee in only 3 hours--and he kept apologizing for taking so long! I'm not a tattooer, but it seems like the knee cap is moving target. That skin shifts all over the place.
And I've never been tattooed by Filip Leu, but no fast tattooer thread would be complete without him. I was lucky enough to see some of the work he did while at Diamond Club, like this tiger that (I think) he completed in 5 hours:
Along the same lines, I've never been tattooed by Robert Atkinson, but holy hell, is that guy fast.