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https://www.extendoffice.com/excel/formulas/add-hours-to-time.html#:~:text=Excel%20Formula%3A%20Add%20hours%20to%20time%201%20Add,complete%20your%20daily%20work%20quickly%20and%20perfectly%3F%20
https://exceljet.net/excel-functions/excel-hour-function
The Excel HOUR function returns the hour component of a time as a number between 0-23. For example, with a time of 9:30 AM, HOUR will return 9. You can use the HOUR function to extract the hour into a cell, or feed the result into another formula, like the TIME function.
https://www.extendoffice.com/documents/excel/2431-excel-count-hours-worked.html
Count or calculate hours worked between times. For example you have listed Start time in cell range B11:B15, and the End time in cell range C11:C15, please do as follows to count hours worked between these times. 1. Click the cell D11, copy and paste formula = (C11-B11)* 24 into the Formula Bar, and press Enter key. See screenshot:
https://www.extendoffice.com/excel/formulas/add-hours-to-time.html
Generally, TIME function is used to convert decimal numbers (hours, minutes, and seconds) to a time in format hh:mm:ss. Here in this formula, it changes the number of hours (8) to a time (8:00:00), and then the whole formula =B3+TIME(C3,0,0) is calculated to: 3:12:32+8:00:00. Remark. If you want to subtract the hours from time, please use below formula
https://www.ablebits.com/office-addins-blog/2015/06/24/calculate-time-excel/
https://www.wallstreetmojo.com/add-time-in-excel/
Now, let’s say we wish to add the desired time interval in excel to a given time: To do this, we divide the number of hours, minutes, or seconds by the number of the corresponding unit in one day (24 hours, 1440 minutes, 86400 seconds) and add the resultant quotient to the given time: Case #1: When the time to be added is under 24 hours in excel:
https://exceljet.net/formula/calculate-number-of-hours-between-two-times
https://support.microsoft.com/en-us/office/add-or-subtract-time-16aa6697-6d6e-49c1-8e2c-3398a7cad6ad
You estimate that the first task will take 6 hours and 45 minutes and the second task will take 9 hours and 30 minutes. Here is one way to set this up in the a worksheet. Enter 6:45 in cell B2, and enter 9:30 in cell B3. In cell B4, enter =B2+B3 and then press Enter. The result is 16:15—16 hours and 15 minutes—for the completion the two tasks.
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