My calcs were quick and dirty and I cheated by looking up an online calculator. To be precise you have to account for acceleration to terminal velocity.
I'd have to sit down and seriously contemplate this to get it exactly right and there are a lot of unknown variables such as drag, mass, was the fall retarded in any signifcant way, and so on.
But, seeing as how I really only come here to discuss AH, read the jokes, and watch the serious threads with interest I'll settle for 7.5 to 11 seconds from start of action to end of the event.
I'll stick with designing poles instead of climbing towers thankyouverymuch