Get chart using DAX

Hi Laur1987 

Thank you for the clarifications. Please refer to the sample file with the solution 

https://we.tl/t-zzBE0gh6YV

Count = 
VAR CurrentJoinTime = MAX ( '81099122685_-_Attendee_Report'[Join Time] )
RETURN
    CALCULATE ( 
        SUMX (
            '81099122685_-_Attendee_Report',
            VAR JoinTime = '81099122685_-_Attendee_Report'[Join Time]
            VAR LeaveTime = '81099122685_-_Attendee_Report'[Leave Time]
            RETURN
                IF ( 
                    CurrentJoinTime >= JoinTime && CurrentJoinTime <= LeaveTime,
                    1,
                    0
                )
        ), 
        REMOVEFILTERS( '81099122685_-_Attendee_Report' ),
        '81099122685_-_Attendee_Report'[Join Time] <= CurrentJoinTime
    )

Many thanks! You saved me! 😄 Can you tell how I can do to shrink time in chart? In this moment I see at half hour. I want to see at 5-10 minute the chart.  tamerj1