lmao sorry
approximately 15 ft (I'd say closer to 16-17 ft though). I ended up getting a 25" (no 20") cable to adjust for the corners, desks and boxes in it's path.
Am familiar with that one and have used it in the past but inching along on the floor and adding it up (I'm terrible in math) was not something I wanted to do lol.
the belt idea is another I later saw after visiting here- some say it may come out differently as belts tend to stretch.
I may have to find string and cut a length in 12" (1 foot) and store that