Beer taps, company retreats, free snacks — the modern workplace is full of office perks. More than 50 percent of employees say that workplace benefits help them achieve a better quality of life — and happiness is, after all, the secret to workplace productivity.

There is, however, one perk that employees want more than others.

According to a survey conducted by Washington, D.C.-based research firm Clutch that polled more than 500 full-time working Americans, 41 percent of respondents said that flexible hours was their favorite workplace benefit. More than 50 percent of employees said that it was the perk that most contributed to their happiness at work.

But what exactly do flexible hours look like?

A flexible work schedule is an alternative to the traditional 9 to 5, 40-hour work week according to the U.S. Department of Labor’s website. It allows employees to vary their arrival and/or departure times, and under some policies, employees must work a prescribed number of hours a pay period and be present during a daily “core time.”

Because the modern workplace is designed around the idea of managing energy and not time, there is no one-size-fits-all when it comes to setting workplace hours (the 9-to-5 workday was introduced during the British Industrial Revolution).

What office perks do you value most?

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