Yes my cousin has this for a month a year! He's moved abroad from abroad so is used to it. He must have sorted it pretty quickly considering they only started dating in DecemberSome employers will let you do it for a certain period in the year. I applied for a job last year that let you work anywhere in the world for three months, and my bf's colleague is allowed to work at home in France with her family each summer as long as he's in the UK the rest of the time.
Given that anyone at his work could find out by seeing it online I would assume he's went about it properly.