https://git.forum.ircam.fr/jilibar858
When wanting to calculate how many work days there are usually in a year, it’s significant to start with the basics. A common season has 365 days, except for step years which have 366 days. Most people work Monday through Friday, making those the typical “work days” in the week. Given that there are 7 days in a week, dividing 365 simply by 7 gives concerning 52. 14 weeks in a given time. Multiplying of which by 5 job days per few days yields approximately 260. 7 work days and nights. This is the simple, rough estimation before considering vacations