I plug a USB drive into a port, on average, 1.1 times a day.
It takes me about 5 seconds to do it. And about 70% of the time I have to flip the plug over at least once because either I've got it the wrong way up, or I think I've got it the wrong way up and then flip it over to actually get it wrong, before I get it right.
To plug it in correctly the first time takes 2 seconds.
Which means that in a year, I plug in a USB 401.5 times, and spend 33.5 minutes plugging USB devices into USB-compatible devices.
Projecting that as a proposed average, and using the known population of the world (7,180,000,000 according to Wikipedia) who are over the age of 15 (73.9% of the big figure according to http://www.geohive.com/earth/population_age_1.aspx) as a multiplier, and we're looking at 5,306,020,000 people across all of whom -- once the bi-directional USB model is applied to all all relevant devices -- a saving of 202,912.9 years of human activity, per year, simply by no longer fussing about inefficiently when plugging in a USB cable.
Over 200,000 years of human activity recovered per year