Overlap

OK, I tried all different kinds of solutions to this and finally decided to just nuke it from orbit. Just to be sure... So basically, the task was that given a set of overlapping meetings, find the total amount of time spent in meetings. So, the basic process is to blow out the meetings from the start to the end for every minute of the day and then check if each minute is actually included in a meeting or not. That's the gist of it. 

Overlap = 
    VAR __Start = MIN('Table'[Start])
    VAR __End = MAX('Table'[End])
RETURN
    IF(ISBLANK(MAX([Start])),BLANK(),
        VAR __Table = GENERATESERIES(__Start,__End,1/24/60)
        VAR __Table1 = ALL('Table')
        VAR __Table2 = GENERATE(__Table,__Table1)
        VAR __Table3 = ADDCOLUMNS(__Table2,"Include",IF([Value]>=[Start] && [Value] <= [End],1,0))
        VAR __Table4 = GROUPBY(__Table3,[Value],"Minute",MAXX(CURRENTGROUP(),[Include]))
    RETURN
        SUMX(__Table4,[Minute])/60
    )

I also threw in a "Not Included" version that kind of does the opposite:

Not Included = 
    VAR __Start = MIN('Table'[Start])
    VAR __End = MAX('Table'[End])
RETURN
    IF(ISBLANK(MAX([Start])),BLANK(),
        VAR __Table = GENERATESERIES(__Start,__End,1/24/60)
        VAR __Table1 = ALL('Table')
        VAR __Table2 = GENERATE(__Table,__Table1)
        VAR __Table3 = ADDCOLUMNS(__Table2,"Include",IF(COUNTROWS(FILTER(__Table1,[Value]>=[Start] && [Value] <= [End]))>=1,0,1))
        VAR __Table4 = GROUPBY(__Table3,[Value],"Minute",MAXX(CURRENTGROUP(),[Include]))
    RETURN
        SUMX(__Table4,[Minute])/60
    )

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