28 minimum days to pass a candidate

What is the minimum number of days required to pass a candidate? According to the Constitution of the Grand Lodge, no daughter Lodge shall confer a degree on any Brother at less interval than four weeks from his receiving the previous degree. However, a Brother may be advanced to a higher degree at an interval of not less than one week, instead of four weeks, if authorized by a dispensation granted by the Regional Grand Master. This is specified in Rule 147.