Explanation
This formula uses the SUMPRODUCT function to sum the result of two expressions that yield arrays. The goal is to sum only time greater than 30 minutes, the "surplus" or "extra" time. The first expression subtracts 30 minutes from every time in the named range "times":
times-TIME(0,30,0)
This results in an array like this:
{-0.00347222222222222;0.00694444444444444;0.00347222222222222;-0.00694444444444444;0.0138888888888889;0.00694444444444444;0;0.00486111111111111;0.00833333333333333;-0.0104166666666667}
The second expression is a logical test for all times greater than 30 minutes:
times>TIME(0,30,0)
This creates an array of TRUE FALSE values:
{FALSE;TRUE;TRUE;FALSE;TRUE;TRUE;FALSE;TRUE;TRUE;FALSE}
Inside SUMPRODUCT, these two arrays are multiplied together to create this array:
{0;0.00694444444444444;0.00347222222222222;0;0.0138888888888889;0.00694444444444444;0;0.00486111111111111;0.00833333333333333;0}
Notice negative values in the first array are now zeros. During multiplication, the TRUE FALSE values are converted to 1 and zero, so FALSE values "cancel out" times that are not greater than 30 min. Finally, SUMPRODUCT returns the sum of all values in the array, 1 hour and 4 minutes (1:04).
Alternative with SUMIFS and COUNTIFS
By itself, SUMIFS cannot sum the delta of time values greater than 30 minutes. SUMIFS and COUNTIFS can be used together to get the same result as SUMPRODUCT above:
=SUMIFS(times,times,">0:30")-(COUNTIFS(times,">0:30")*"0:30")
Times over 24 hours
If total times may exceed 24 hours, use this a custom time format like this:
[h]:mm:ss
The square bracket syntax tells Excel not to "roll over" times greater than 24 hours.
With a helper column
As shown in the example, you can also add a helper column to calculate and sum time deltas. The formula in D5, copied down, is:
=MAX(C5-"00:30",0)
Here, MAX is used to get rid of negative time deltas, caused by times in column C that are less than 30 minutes. Notice the result in D15 is the same as the result in G5.
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Related functions
TIME Function
The Excel TIME function is a built-in function that allows you to create a time with individual hour, minute, and second components. The TIME function is useful when you want to assemble a proper time inside another formula.
SUMIFS Function
The Excel SUMIFS function returns the sum of cells that meet multiple conditions, referred to as criteria. To define criteria, SUMIFS supports logical operators (>,<,<>,=) and wildcards (*,?,~), and can be used with cells that contain dates, numbers, and text.
COUNTIFS Function
The Excel COUNTIFS function returns the count of cells in a range that meet one or more conditions. Each condition is provided with a separate range and criteria, and all conditions must be TRUE for a cell to be included in the count. COUNTIF can be used to count cells that...
