  Most workers don't use all their vacation days in the first
place.  About 57 percent of working Americans had unused
vacation time at the end of 2011, and most of them left an
average of 11 days on the table - or nearly 70 percent of their
allotted time off, according to a study performed by Harris
Interactive for JetBlue.  Employers certainly aren't
complaining. Separate data from financial information company
Sageworks shows profits-per-employee are at a 10-year high.
Could workers cramming in more hours be a factor? Yes, says
Libby Bierman, a Sageworks analyst.  "We don't have exact
information on why profits increased, but I think it's safe to
say it's a combination of people spending more time at work and
technological advancements," she said.  As companies cut back on
staff during the recession, they learned how to get by with a
leaner workforce and rely more on technology.  Since then,
employees who saw their workloads build up over those years feel
they can't afford to take time off.  One of the big