Holiday
Source.
As a business owner, I only ever work half days!
...and I even get to pick which 12 hours!
Also "unlimited vacation days just as long as you get your work done" equals no vacation days
I’ve found it’s kind of a gamble on whether you have a cool manager or not. I have “unlimited” vacation and a chill manager and tend to take 5-7 weeks off a year which is quite high for a mid level programmer in Canada.