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//src - https://support.office.com/en-us/article/Add-or-subtract-time-16aa6697-6d6e-49c1-8e2c-3398a7cad6ad
=SUM(L9:L11)
in the result cell > Format Cells > Custom > [h]:mm:ss
origin - http://www.pipiscrew.com/?p=9620 sum-time-cells-in-excel
Sum time cells in Excel
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