How many feet are the old films?

AKA,
What would it take to make a 4k library of the old analog films?

Saw this website:
http://www.imagine-it-entertainment.com/4K_Film_Scan/

and $0.49/ft. for 4k... thought, wow, that's sorta expensive, but have no idea how many feet it would take to get say Harvest upgraded...

All I can think is grab a shit film watch a Hour and a half of it. stop, eject. cut it open and measure :-P

http://www.scenesavers.com/content/s...age-calculator