When a conjunctive participle is reduplicated (the verb stem is repeated), it indicates an action that is repeated many times.
मैं यह आवाज़ सुन-सुनके परेशान हो रहा हूं – “I’m getting annoyed listening to that sound again and again!”
वह काम कर-करके थक गई – “She got tired from working over and over again”