Watch this video to know about the steps How to add Time in Excel

Use the following custom number formats and the SUM function in Excel:

Hours = [h]:mm:ss
Minutes = [m]:ss
Seconds = [ss]

Create a worksheet and type the below given values. Make sure to use a colon (:) to separate the numbers.
A1: 12:36:58
A2: 12:25:30
A3: 11:19:23

Type the below mentioned formula into cell A4. Excel automatically formats the result correctly .

A4: =SUM(A1:A3)

Excel displays 36:21:51 as the total.