102 inches is legal, but that must include your side mirrors too. Wide body motorhomes have the body being 102 inches and the mirrors can stick out at least another foot on each side. How far you can stray from the interstate varies by state.
Sometimes, you need to know exactly how many years, months and days between two dates, in this situation, the following long formula may help you. 1. Years,  & DATEDIF(B1,B2,YM) &  Months,  & DATEDIF(B1,B2,MD) &  Days. Note: In the above formula, B1 indicates the start date and B2 stands for the end date, you can modify them as you need.
Excel has several built in date functions that can be used to calculate the number of days between two dates. Each date function does a different job so that the results differ from one function to the next. Which one you use, therefore, depends on the results you want.or help with this example, see the image above. Since the DATEDIF function can be used to find either the number of days, the number of months, or the number of years between two dates, this example will show separately how to calculate all three between the dates of July 9, 2010 and November 2, 2012.