Damn. Less than 4 weeks/year would be illegal here (it’s also mandatory that an employee can take at least 2 weeks of that as a continuous single block, if they wish.) Employers are also not permitted to buy holiday allowance back (except when an employee leaves) and must roll any unused over year on year - which means employers are strongly motivated to have their staff actually take their holidays.

“Here” is, obviously, not the US…