I think you are still missing the point in terms of build time. The work actually goes pretty fast when you actually follow the plans. No real thinking to do---other than studying the plans to understand what they are saying---you just check the items off as you go. When I changed my Longez from updraft to downdraft cooling, mounted the master cylinders up front, hung a bigger motor on, etc----now I was deviating from the plans. Sometimes seemingly trivial items would occupy untold amounts of time. I remember for example that the larger engine required a push pull throttle cable. I had to research what kind of throttle cable I needed, how to modify my brock throttle quadrant for push pull, what kind of connectors actually need to go on the throttle cable (there are quite a few), how to attach it to an assymbly that hooks to the carb (modified a Vans carb/cable mount), and how and where to penetrate the firewall. Even penetrating the firewall turned out to be a big deal. I originally fed the cable where I wanted it to go but found that the bends the cable was trying to do made the cable too stiff to operate. After trial and error---and making swiss cheese of the firewall, I figured out another approach. Take a short piece of throttle cable, hook it to the carb and the Vans "retainer" and see where the cable wants to go thru the firewall. Once I learned that lesson, things went great. But there was an incredible amount of time spent on the computer researching, digging through CPs, and time spent underneath my aircraft staring at it.
Following the plans----ALL of that headscratching vaporizes.
If you want to build fast---follow the plans---or follow someone elses well documented changes.
In terms of people with the really long build times----I once mentioned to a longez builder that there was another guy on the field who had been building his Longez for 20 years. He looked at me, smiled, and said, "No he hasn't---sounds like he has been doing a lot of things other than building his longez for 20 years."
One last item on aircraft finish. Some people spend a long time trying to get the finish correct and smooth. Sanding with the long boards will make it go fast and look good. I think Wayne has some stuff on his site that talks about finishing a canard. There are some EZs out there that look to have been hand sanded (no long boards) and look real rough.