http://digiday.com/agencies/dark-side-unlimited-vacation-pol...
> Asked how many days off she took last year, Dawkins was surprised. Forced to think about it, she realized it wasn’t very much: just 14 days, although “it felt like a lot.” There is a game to play, she admits: “You are subconsciously thinking about ‘does this appear to be too much time,’ but that’s human nature,” she said. “There have to be checks and balances with management so there’s a process in place.”
Kickstarter last year reportedly rescinded its policy because of this effect:
https://www.buzzfeed.com/carolineodonovan/at-kickstarter-fle...
> It’s always been important to us to ensure that our team is able to enjoy a quality work/life balance,” the Kickstarter spokesperson told BuzzFeed News. “What we found was that by setting specific parameters around the number of days, there was no question about how much time was appropriate to take from work to engage in personal, creative, and family activities.”
Another side effect: with no minimum number of vacation days in place, employers are not required to compensate employees for accrued vacation days when they quit.