I think the current solo record stands at just under 39 days, or ~7knot ave. The mono record is about 42 days @ ~6.5knots (maths was never my strong point, so check those figures). I'm not sure of the record he's aiming for.
I remember this was pretty impressive when launched many years ago, but also recall she never really sorted her teething problems. The advertised price probably represents a small fraction of the total cost, but a large fraction of post refit/rebuild value...
To be fair you were stand to... "aggravated tone" and "near crash" are subjective, and "hold your course" is a pretty reasonable acknowledgment of your rights and responsibilities and his intention to avoid you. Hopefully all is well that ended well, and nobody proved to be an asshole.
Unless you need to have someone aboard while backing the trailer in, ie, there's no pier/pontoon to launch next to - I can't see any need for an extra set of hands. Most things can be done solo with a little forethought.... as to mast raising, that's another question!