Also do you take extended periods of time like 15-20 days, or small periods like 5-days? And also what kind of things do you usually do? Travel, visit family, work in side projects, etc
I'm curious to see if there are great differences between people located in different parts of the world, who work in startups vs in more established companies, etc
By law you are granted 25 days vacation per year, assuming you have worked enough to "earn them", generally you get 12.5-13.x% extra salary per day worked that goes towards your vacation.
The law also says that you have a right to 4 weeks uninterrupted vacation during the June, July and August. At least two months before the (requested) vacation you must get a definitive decision. The employers are not allowed, by law, to change their mind about granted vacation time.
I believe I saw a study that recommended shorter, more frequent, vacations as the best way to recover from mental fatigue but I assume that there is a lot of opposing opinions on that matter.