Scientists have found that people who go on holidays for less than eight days are not able to get over the stress of the journey or adapt to their destination before having to fly home.
Writing in an introduction for their paper on the matter, they shared: "Do we need vacations? And how long should a vacation be? In an article of the New York Times in 1910, William Taft, 27th president of the US stated '[...] 2 or 3 months' vacation [...] are necessary in order to continue work the next year with that energy and effectiveness which it ought to have.'
"Today, the discussion about the benefits of vacations is still ongoing, evident in the fact that many countries worldwide (including the US) have not established national vacation rights. Is the answer to these questions still missing? And besides the ideal length, which factors determine the extent of 'energy and effectiveness' we bring along to our work after vacation? ...
"Employees are often unable to recover sufficiently during short respites from work due to increasingly permeable boundaries between work and home domains, long working hours, working overtime and prolonged physiological activation as a result of pre-occupation with work ... Therefore, a longer period away from work may be needed to fully recover from work. Vacations represent the longest period of temporary absence from work and may, therefore, constitute a more powerful respite opportunity than shorter rest intervals."
For most people looking to relax and recharge their batteries, a holiday of around seven to 10 days is ideal but for those who want to explore, longer holidays are best.