I think they are all about the same unless your nickname is "Rainman." It can take some people a few days, a few weeks, a few months. Comes down to skill, time and money. I am in no hurry but i am not going to spend 6 months on a one month project. I assemble my arfs in a strange fashion.
I set a goal, if it takes me two hours to install wing servos then fine. If it takes 20 minutes. thats it. Or I want to get the wings done this week. Thursday they are done. Welll thats it for the weeks.
Plus Arfs need a little extra attention. Really does not take long but is necessary such as a little extra epoxy around the firewall. If you have retracts, remove them and apply epoxy to the mounting rails. Failure to do this will result in both of the above coming apart after only a few flights.

My order goes like this. I always do the wings first and get them operation to include retracts. Then I work from the back end of the plane forward. The engine is always last but this is me and how I do things. If you dance all around the plane you may forget something which will cause you a big problem