Study: Most Americans don't use all their vacation time

According to a recent survey by Expedia, only 38 percent of employed adults in the United States used all of the vacation time they accrued in 2010, with a combined total of 448 million vacation days going unused. Based on the average wage of $39,208, this equates to approximately $67.5 billion worth of time.

The higher-than-required levels of employee attendance are thought to be partially due to the current economic climate.

"Headcount is so low, salaried employees are probably doing a job-and-a-half minimum, maybe two jobs, and they can't get away," Mickey Kampsen, president of Management Recruiters of Charlottesville, told CNN. "They are trying to bring as much value as possible to their company in order to keep their job."

Clinical psychologist Deborah Mulhern explained to ABC News that those who do not take enough vacation time may be weakening the neural connections in their brains that produce feelings of calmness. This may result in increased difficulty in relaxing over time, which can impair restorative body processes.

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