There is no reporting on how much time you spend in DND, as there is also no reporting on how much time you spend in CFA, logged in a hunt group, etc
The only way to get this info would be looking at CUCM traces to find out at what time they press the DND softkey
BTW: I'm assuming this is CUCM 7.1(2) as you do not mention what you use.
HTH
java
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HTH
java
if this helps, please rate