This is the option that decides the final value of this field. Some users may want specific results or less rounded results, and some may want time format in the result itself.
Use Decimal Points with Hours: With this option 2 hours and 20 minutes of a difference would result in 2.33 as the result (20 minutes being a third of an hour).
Use Total Hours: Here the value is rounded to the nearest hour and simply gives a final integer value. e.g. 4 and 37 minutes will result in the value: 5.
Use Time Format: Some users prefer to see the actual time format as it is easier to read and interpret when thinking about time. In this case 3 hours and 42 minutes will show as 03:42. Please note, with this option you will not be able to apply Maths calculations or totals to it.