Finds that employees in countries that take more vacation do have a strong desire to get a lot done as well as a tendency to move faster. So while our particular study did not find that having more vacation reduced stress, we do see evidence that it results in greater productivity at work all the same. In other words, it’s not that taking a break will refresh your brain and let you get more done; it’s that simply spending less time at your desk forces you to waste less time.
https://hbr.org/2015/06/are-we-more-productive-when-we-have-more-time-off