@sknup a 2 wide aquaduct would take a team of 6 over 60+ hours (quick underestimate) each I assume due to all the terrain they would battle employing perhaps 3000 diamond shovels maybe more, several picks would have to be used also. And for what? A boat route so you could travel around the world border which would be hardly used due to low need as nearly nobody has a base there because a player could do as Nerdie is doing to find a base. Although I don't doubt it will be used but I do doubt it will be made.

Doing a quick test on a new world I found that by going 100 blocks with non extreme terrain building a canal along the world border took 3min 11s to both dig and build a little at y 70 it would take 7+ minutes total per 100 blocks the most tedious work being water brcause of the constant need to refill buckets by getting water from what you've already placed(infinite water source) along the way you can mine blocks for use in the canal but from what I've studied in this project is it would take perhaps 1000 hours of hard constant work in total, higher than my previous estimate (which I didn't consider water)

@sknup you are truly a talented builder and have spent many long hours building. A canal is an entirely different story and would take massive dedication to continually repeat a building pattern for 800,000 blocks.