I had an arthroscopy on my ankle in Feb last year. I asked for a ankle block so I could at least walk out of the hospital into a car. It was 2 weeks before I could really go back to work, and they told me 2 weeks was about normal. I actually had 3 weeks off cos it was over half term and was able to walk okay enough to work. Having said that, I don't drive so I'm not sure- you'd need to be able to perform an emergency stop! In the first week you are taking codeine so can't drive. I would allow 3 weeks but maybe try and get a lift/car share to work after 2?