When using "Day and Hour" breakout on a report, one is not able to filter on day/hour. In order to filter, one has to use "Day" and "Hour" breakouts separately, then one can filter on day or hour. This is workable but when you are using 5 breakouts (the current max allowed) then you have to sacrifice one of the other breakouts to accommodate "Day" and "Hour" separately. The idea is to allow filtering on "Day and Hour" breakout or allow more than 5 breakouts on a report.