So, now that we’ve established once and for all that holidays are a pretty damn good way to give our happiness levels a boost, let’s take it to the next level with this top tip.

It turns out that the length of a holiday can also have a bearing on how much we enjoy our time away. Researchers at Finland’s University of Tampere say that we can find it difficult to let go of work-related stress, and therefore a holiday lasting between 7 and eleven days is needed to ensure we properly relax.

The study explains: “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.

This is how long your holiday should be for optimum happiness