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Lidia Matzek5,481 Points
Why is this not working:
=COUNTIFS('2017'!V2:V26411 , ">"&B6-B10 , '2017'!V2:V26411 , "<"&B6+B10) / B1
Brendan WhitingFront End Web Development Techdegree Graduate 84,733 Points
I see that you're referencing the V column in '2017', in my spreadsheet I have the T column. We deleted a couple columns when we were cleaning up, so now my Official Time column is T.
Try to use " ; " instead of " , " , and take a good look at your Official Time Column.
My Official Time Column is S, so this worked for me: