Report needed- count of closed within time windows by technician

Report needed- count of closed within time windows by technician

Hi, 
I'm needing a report and I can't seem to come up with it. I am essentially needing a count of tickets closed by technician within certain periods, based on createdtime and completedtime into "buckets" of 0-23 Hours, 24-47 hours, 46-71 hours, 71+. In other words, how many tickets were closed by each agent in less than a day, 1-2 days, 2-3 days, or longer? 

I can't seem to modify any queries successfully to pull this off, though it should be fairly simple.... can anyone help?

Thank you!

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