That probably makes you quite an outlier.
Instead of 8 hour work days each week with 6 weeks of vacation, wouldn't it be nicer to work just 5 hours a day for 365? Or maybe a few days with 3 hour days and a few days with 8 hours? This seems so much more relaxing than crunching 8 hour days every work day.
If the workload dictates requirements I'd love to find anyone who wanted a constant queue of variable days but I've never met them aside from contractors who want a minimum and will bill extra, but they still seem term-based and want vacation.
At a managerial level i can plan around predictable days off, but not variable days when i need to coordinate more than a few people.