I think most people with arf assembly experience probably could get the plane flight ready in 15-20 hours. Now having said that if you do that and just take it out and fly it it will not be long and you would be able to have them ready in 5 or 6 hours because you will have a lot of arf building time in a vry short while. With me I don't think anything of tearing the covering off of the bottom of an arf and going over the whole fuse with a good inspection and a bottle of glue this also aids in the push rod and pull-pull instalation and the ammount of time I spend on alignment and incidence checking adds several hours to assembly. Now this is just the way I do an arf and some will not spend as much time on them. I look at arf's as the ultimate short cut to having a nice plane, some guys look at arf's as disposeable and do not put near as much time into the assembly of an arf as they would in the final stages of a kit that they built. It kind of makes sense to me but I look at my arf's in much the same way that I look at a kit that I build in that I have a lot of time and effort into it and I want it around for a while.