RE: How long does it take to build an ARF?
This really is kind of a useless question that will generate endless responses from builders and assemblers. What is the point of it all and how fast do you work?
As far as the aircraft, they are what they are, and they are not all created equal. If you go cheap, expect to spend a lot of time and money making things right on it. Even if you spend a lot, expect to take some time making it a better and more lasting airframe.
Bottom line, who really cares how long it takes? I don't. If you want it, you will spend whatever time it takes to get it the way you want it. If it is too big a project for you, and you don't want to involve another person, just pass on it.
This survey has no real answer. Just too many variables.