Entering Large Time Values

If you format a cell for elapsed time (using a custom display format of [h]:mm:ss), then Excel allows you to enter hours, minutes and seconds into that cell. For instance, you could simply enter 129:14:30 to signify 129 hours, 14 minutes, and 30 seconds. You run into a problem, however, if you try to enter very large time values into the cell. When you try to enter time values in excess of 10000 hours, as in 12721:52:45, then Excel won't parse the entry as a time, but treats it as text.

The interesting thing is that when a cell is formatted for elapsed time using [h]:mm:ss, the cell can easily display elapsed times that have more than 10000 hours. Thus, you can sum a range of cells to result in a value more than 10000 hours, but you cannot enter a larger value.

Unfortunately, there seems to be no way around this in Excel. The best solution, however, might be to rethink how the data is entered. After all, 10000 hours is equal to 416 days and 16 hours—well over a year. You could easily create a column for entering days, and use another for partial days. A third column could then use a formula to return the elapsed hours based on the other two columns.

Another solution is to simply not rely on Excel to do the parsing of your input. If you have a huge number of hours to enter (such as 32315), then you could enter the following in the cell:

=32315/24

Excel maintains what you enter as a formula, but displays the proper number of hours, minutes, and seconds. If you want to get more precise, you can enter a fractional amount that represents the portion of an hour represented by your time. For instance, 37 minutes and 15 seconds is 0.620833 of an hour. Thus, you could enter the hours as follows:

=32315.620833/24

Of course, entering times in this manner can get tedious, particularly when you have calculate the fractional portion of an hour represented by minutes and seconds. To overcome this, you could create a custom function that allows you to enter hours, minutes, and seconds, and returns a value that is easily formatted using the elapsed time format. The following function will do the trick:

Public Function RealBigTime(hr As Double, _
  min As Double, sec As Double) As Double
    Dim hr1 As Double
    Dim min1 As Double
    Dim sec1 As Double

    Application.Volatile
    hr1 = hr / 24
    min1 = min / 24 / 60
    sec1 = sec / 24 / 60 / 60
    RealBigTime = hr1 + min1 + sec1
End Function

After creating the function, enter something like =RealBigTime(32341,30,45) in a cell. The result is a value that can be formatted with the elapsed time format to 32341:30:45.