Once. My job position at the time wasn't super important and the time off policy shifted that I had to use 8 weeks of vacation that year (large corporation).
So, I spent nearly three weeks traveling around the UK, France, and Spain. Catching Pearl Jam shows, seeing sites, hanging out at the beach. It was a memorable experience.
Since then, I have a little more important job at the company and take one week max (which is unusual for me to do).