I work under Plan B - only because with work it is easier to take a week or 10 days (with a holiday included) at a time so I am blessed to go twice a year on average for a week or so. Now what is worthwhile is a the really long wait and saving for a true sabbitical. Life changing. Took a year and 3 jobs but was able to swing 4 months one year. I am so grateful that I have been able to go so often. My longest wait was a whole year and it was pure agony. Markus is right about patience though .... it takes every bit in between trips.
Great question.