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sachitanand kumarsachitanand kumar 

send alert email when case owner change..

when i change  the case owner and when new case owner not do any activity on the case within 4 hour than send a alert email to the admin and new case owner
SandhyaSandhya (Salesforce Developers) 

Please refer below link which has similar discussion and solution with a screenshot.
Please mark it as Best Answer if my reply was helpful. It will make it available for other as the proper solution.
Thanks and Regards