Having built an US60, if you do a "vanilla" build, you're probably looking at about 3 to 4 weeks of the 2-3 hours per night, four or five nights a week. They go together pretty well, and the instructions are good. Just do things in the order GP suggests and you should be fine. I'd figure another week to cover it. And the sanding's not that bad... just get a razor plane to shave everything down first.

Where things get interesting, and therefore take more time, are your choices regarding (1) dual/single aileron servos; (2) adding flaps (which means another servo mount is in the mix; (3) engine choice (a Tower 75 will want to swing a 13" prop, which means longer landing gear struts); and (4) retracts. Mike's build thread takes you through all of this, but it still takes some mental engineering and judgement, both of which extend building time. (FWIW, I wouldn't do the retracts again, but if somebody held a gun to my head, they'd be air up/spring down with a 3/8" robostrut.)

I've built and flown both a VTE Venture 60 (first cousin to a 4Star) and the US60. The Venture build was simpler because of the flat wing and that BTE puts together what might be the best kit I've ever seen. But the US flies in a much more spirited manner.

No one has mentioned it, but one of the Goldberg Tiger 60's might also be a nice choice. It'd be way overpowered with a 75, but some folks love that