I think you misunderstood. Let me give a real-life example: My colleague and I both get 30 days of paid leave per year, but we work in different roles and I happen to be under a bit better union agreement where Saturdays don't count. Let's assume we both take all of our leave in one go:

I'm away from the office for 6 weeks (6 x 5 days = 30 days).
My friend is only away for 5 weeks (5 x 6 days = 30 days) because Saturdays are counted as part of his holiday, even tho he never works on Saturdays.

[–] Nighed@feddit.uk 2 points 1 day ago (1 children)

Don't you just take mon- Fri as 6 separate holidays?

[–] JRaccoon@discuss.tchncs.de 2 points 1 day ago

I'm not super familiar with the rules regarding this, but I think that even if your holiday ends on Friday, the following Saturday gets automatically counted. So no, that wouldn't work. Additionally, many workplaces have rules in place requiring you to use at least a certain number of your paid vacation days uninterrupted.

Obviously, the whole thing is super dumb and a historical relic from the time when Saturday was a normal workday.