Easy way to get legend coins?

It does take about 13 minutes of forging to make Smithing lv.10 but most of it's afk time anyway, you could start a mule on another computer while you wait.

And 90 minutes for mining, unless there's some cheat so you get more than 20 mastery per plate.

I just bought and refined addy and bronze ores, then used them for arrows.
A little slower on the harvesting professions, yeah, in the early levels. But that kinda gets made up for by them not losing their mastery in the later levels, like the crafted items do.
The 200 fatigue is a godsend for this.