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.
If both dates are valid, a result box will be displayed with the period information, i.e. the exact number of days between the given dates and also the numbers of weeks, months and years. Please note, that the number of days is always exact, the numbers of months and years may be rounded to the nearest full value. For example, if the period calculated equals to 33 days, the calculator will show approx. 1 month as a result. Our calculator will validate the dates you entered, and the result will be shown if both are valid.