My guess is it's a typo in: 10,000ns ~ 10us = [green cube] and it's supposed to read 10,000ns = 10us = [green cube] and this is a key as are black red and blue,

My guess is it's a typo in: 10,000ns ~ 10us = [green cube] and it's supposed to read 10,000ns = 10us = [green cube] and this is a key as are black red and blue, all of the speed measures are approximate.