How much time do I need to take off from work?

For LASIK, you can return to work quite quickly. Theoretically, you could work the day after surgery. However, most people will take the first day off and return to work the next day. Care needs to be taken to avoid contact with the eye during the first week.
For PRK, most people will take a week off from work. While some are able to return to work after just a few days, it is unpredictable. If your schedule is not flexible, plan on a week.