every launch is different.
at mead-callville, depending on time of day, it's 15+ minutes just to walk from the launch to the parking lot if golf cart dude isn't running.
you would be shot taking up 1 of the 3 or 4 spots to tie off a boat at the launch taking that long not to mention you would never get the boat tied off with the influx of people all day long.
in green bay, it's 15 ft from the launch to the first spot. you would have the same task done in less than 2 minutes. no one there cared if it took 5.
'06 Supra Launch 20SSV-gone but never forgotten