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I6{=TEXT(SUM(--IFERROR(TEXT((MID(B6:E6,8,5)-H6)*1440,"0;!0"),))/1440,"HH:MM")
J6{=TEXT(SUM(--IFERROR(TEXT((LEFT(B6:E6,5)-G6)*1440,"0;!0"),))/1440,"HH:MM")
K6{=TEXT(SUM(--IFERROR(TEXT((H6-MID(B6:E6,8,5))*1440,"0;!0"),))/1440,"HH:MM")

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