Report on Ticket Scan time for a performance

Hello,  We are selling timed entry tickets for our admission and exhibition performances with the zone acting as the entry time slot- 60 minutes.  I am attempting to create a dashboard that shows when tickets are marked at attended within an entry time slot.  Anecdotally, we are seeing most people arrive within the first 20 minutes. 

We are also seeing attrition and want to analyze arrival times and qty within each time slot to help us understand the behavior by entry time, performance, day of week, and price type so we can make a plan for releasing additional tickets to a standby line.

I tried using the Date field from the Attended Date dimension and display as Time and by Every Minute to display the Attended Count fact broken by Zone.  However,  Analytics only returns a "00:00" value and total Attended count for the entire zone.  Assuming this means that Analytics does not include the time stamp from the T_ATTENDANCE table which is a bummer.

Any help is appreciated.

Thanks,  Matt