The traditional 9-to-5 work week has been replaced in many cases by hybrid hours that fit your needs-but at what cost, if you do too much work?

But working a nontraditional schedule, and checking in during all hours of the day, night, and weekends, is not necessarily beneficial for the modern workforce, according to new Cornell research.

"Even if you're still working 40 hours a week, you're working during time that you've mentally encoded as time off, or as time that should be for a vacation-and that can make you feel suddenly that your work is less enjoyable," said Kaitlin Woolley, Cornell's SC Johnson College of Business.

"We had this feeling that sometimes the ability to work when we want to could also impact how we feel about our work," Woolley said.

So, she and Laura Giurge, assistant professor of behavioral science at London School of Economic, started examining the effects that off-hours working (or studying) has on job satisfaction and motivation.

In one study, the researchers approached Cornell students studying in a campus library on President's Day. They reminded half the participants that they were studying during a federal holiday; the other half did not receive this reminder. They then measured students' intrinsic motivation for their schoolwork-asking them how enjoyable, engaging, interesting and fun they found their materials to be. Students who were reminded the day was a federal holiday reported that their work was 15% less enjoyable.

In another study, the researchers measured whether a simple calendar reminder on a federal holiday (MLK Day) would alter full-time workers' perception of work enjoyment. They found that work was 9% less enjoyable on the holiday Monday, compared with a typical Monday, despite engaging in similar work-related activities on both days.

In the third study, participants were surveyed on a Tuesday, with no reminder that it's a typical work day, then again on a Saturday. Some participants were reminded that it was Saturday, "a weekend day," while others were given no reminder. Both groups reported lower levels of work satisfaction on the weekend day, although the effect was stronger in the reminder group.

Woolley and Giurge think part of this discrepancy has to do with the idea of "collective time off"-having free time when friends and family are also off.

"The real benefit of time off on the weekend or on holidays is that it's not just that I have time off, but my family and friends have time off, too," Woolley told the Cornell Chronicle. "And so, one thing that we suggest for managers is, can you create a 'weekend shift' so people feel like they're in it together with other people?"

The idea of "work-life balance" - setting boundaries between work and "play" times - has been a priority for many employers and employees recently. Woolley said it can be hard for workers who feel pressured to achieve to commit to striking that balance.

"It's hard sometimes for workers who aren't in a position of power, whereas I think managers have the responsibility to create that environment for their employees," she said. "I do think people are becoming more aware of the importance of that, and shaping their jobs and their life choices to allow for it."

Their results were published as, Working During Non-Standard Work Time Undermines Intrinsic Motivation, on Feb. 26 in Organizational Behavior and Human Decision Processes.

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