Hours over nine (9) by timekeeper in a day

It seems to me this question has come up before.  I thought there was a solution, but don't recall what it is. 

Client with 20 timekeepers wants to be alerted when timekeepers enter more than nine (9) hours of time in a day.  An alert can handle it by the current day, but is there a report that could be generated that would show only 9 hours or more entered in a day for the past two years or so by timekeeper?  The client would prefer not to have to read a report with all daily hours.  They want to see only hours entered nine or over in a day for a period of time.