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Adding Past 24 Hours
We can simply add times by using the Sum function, or a simple addition sign, e.g.
=Sum(A1:A5) would result in the total hours of that range if A1:A5 contained valid times. There is however a big "Gotcha!" and that is, unless told otherwise, Excel will not add past 24 hours. This is because when the time value exceeds 24 hours (true value of 1, or 1 day) it rolls into a new day and Start s again. To force Excel not to default back to a new day after 24 hours we use a cell Format of 37:30:55 or a Custom format of [h]:mm:ss
Showing Total Times in Minutes or Seconds
The same format can be used to get the total minutes or seconds of a time, for example to get the total minutes of the time 24:00 format the cell as [m] and you will show the number 1440 (60 mins * 24 hours). To get the total seconds use a custom format of [s] and you show 86400 (24 hours * 60 mins * 60 secs). I say "Show" as changing a cells Number Format does not alter its true underlying value, which is the whole number 1 (24:00) in this case.
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