Assuming B28 and D28 contain both time and date and also assuming that
these might be on Sundays this formula will give total hours excluding
any time on a Sunday

=INT(D28)-INT(B28)-INT((WEEKDAY(B28-1)+INT(D28)-INT(B28))/7)+IF(WEEKDAY(D28)=1,1,MOD(D28,1))-(WEEKDAY(B28)<1)*MOD(B28,1)

format as [h]:mm


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