Depending upon where you're headed, your move could take an afternoon or involve a few days of driving. If it happens to be the latter, how do you figure out how many days to take off from work?
Start any pre-move planning by talking to your company's HR department. These professionals can tell you how much time you'll have to take off per the company's guidelines.
It's always a good idea to err on the side of caution. Even if you think you can get the move done in two days, take three days off just to be safe.
When considering your travel time, be as thorough and detailed as possible. You'll need to stop for bathroom breaks, the occasional meal and, if it's a cross country move, you might need to stay at a hotel. Use online services like Google Maps to plan your route and estimate for travel time.