I rode almost all the way to other side one day (then the wind starting dying) and turned around. I would guess if it were blowing 15 it would take about 50 minutes to go across and back, (see below for "across and back").
Does that sound close, or am I way off?

Just one boat or jetski out there would be nice, just in case.
We could go to a place more north than where we launch on the south side sw and turn around from that point, maybe. More like a straight out, straight back, after touching the other side kind of race. Instead of having a downwind component.
Just some thoughts, doesn't matter too much to me.

I will volunteer to man a boat if someone brings it. I know how to drive and have some experience with kites in the water, etc.