Not Overworking Equates to Better Productivity

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"Moreover, Leslie Perlow and Jessica Porter of Harvard Business School have shown that requiring time off results in better economic performance. They conducted a study wherein a Boston-based company provided two control groups. The first worked long hours (50 or more a week), skipped part of their vacations and were constantly on call. The second worked a 40- hour week, took full vacations, and left their BlackBerrys at the office.
At the end of their study, Perlow and Porter found that those on time-off teams reported higher job satisfaction, greater likelihood that they could imagine a long-term career with the firm and higher satisfaction with work/life balance.
No surprise there. But the time-off control group also reported increased learning and development and better communication with their teams and, most surprisingly, they actually produced more total output than their workaholic colleagues."