Humans move their eyes every few hundred milliseconds and you can only read a handful of words after each eye movement, so this suggests that they read about a hundred words total, and probably a lot less if you factor in "seeking" time (e.g., to find the section headings).
http://cdn.theladders.net/static/images/basicSite/pdfs/TheLa...
People typically read ~200-300 words per minute. 100 words is a lot more than what you end up reading on most CVs when you go through a pile. You basically scan a CV for a few seconds and move on to the next unless something caught your interest. When so you actually spend a few minutes reading the whole thing - bringing the average to, indeed, under 10s per CV. If HR did its job before sending CVs your way the average is much higher of course.
https://steveblank.com/2011/08/05/bonfire-of-the-vanities/