That is working now for the whole year, however if I add another trip into the same month, it only calculates that last trip and disregards previous days within that month.
for example.
In F9:G9 I have a trip spanning Nov & Dec. So I should return 11 in C32, which I do until I add a 2nd trip in Dec. C32 then disregards the dates in F9:G9 and instead only counts the dates in F10:G10.
Sample (1).xlsx
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