A full house rewire can take anywhere from a few days to a few weeks, depending on the size and complexity of the home. If the home is relatively small and simple, the job could be completed in just a few days.   However, if the home is large and/or has a complex electrical system, the job could take a week or more. In any case, it is always best to consult with a professional electrician to get an accurate estimate of how long the job will take.