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.