Report Help: Breaking Work Logs Down Into Grouped Time Frames

Hello All!

I am trying to create a report that will show me a break down of our work logs by time slots per day.  

For example, I would like to see how many case work logs are created between 8-10am, 10-12am, and so on.

All I have been able to do so far is show me the exact times that each one is entered. 

I have tried every way that I can think of and still cannot get it.  Please help!!