I need some help on a excel program I am making for our duty and flight times for the FAA. I need the calculation for time and then convert it to tenths. Example Start Off On Off times as entered onto the flight logs, if your start is 0800 off 0815 on 0915 off 0922 your block to block is 0122 which would be flight time according to the FAA and would be 1.4 hrs. I need the formula to get the 0122 block to block time by figuring the minutes between the Start and Off times and then I need the formula to derive the 1.4 hrs. from the Block to Block time. Any help here would be greatly appreciated. Thanks