6 weeks isn't a normal vacation. 20 to 30 days vacation allowance (excluding public holidays) is the norm in the private sector and while in theory you could use 30 days to take 6 weeks off, you'd have nothing for the rest of the year. 2 weeks is a normal big vacation, over summer, often in August.

Overlap it with public holidays, and you can get 17 or 18 days off in a row for 10 vacation days - 10 weekdays, three weekends and a public holiday or two. But it's usually better to plan a public holiday somewhere in the middle because of the extra traffic.

As terminology though it's not a sabbatical either. 6 weeks off sounds more like a gap between jobs with gardening leave or travel or some other project that wouldn't fit in a work vacation.