Open Automator 
 
Files and Folders -> drag "Get Specified Finder Items" to open area 
Files and Folders -> drag "Duplicate Finder Items" to open area 
Utilities -> drag "Loop" to open area 
 
In "Get Specified Finder Items", click "add" and select the folder item to duplicate (jpg, png, etc). 
In "Loop", select "Loop Automatically" and input number of times/minutes to duplicate 
 
Click Run
  
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