A "hassle unit" is a standard unit of measure defined by a scale from 0 to 100 used to indicate the difficulty involved in completing a task. The low end of the scale (0) indicates that the task is easy and will be accomplished without effort. The high end (100) indicates that the task will require massive amounts of effort to complete and is nearly impossible.
"Meeting you for lunch today will require 10 hassle units, the restaraunt isn't too far from my office."
"Rewriting that entire proposal before end of business today will require 90 hassle units, but we'll do our best."
"Deciphering John Kerry's position on Iraq requires 99 hassle units.