"crack" after lumbar manipulation

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Side posture lumbar manipulation if successful is followed by a audible click. Form where that originates is a question? After one successful side posture lumbar manipulation, if another side posture lumbar manipulation is tried immediately then one may not hear another click. There is a refractory period between another click is heard with a successful side posture lumbar manipulation. What is the duration of that refractory period?
The answers are the audible "crack" heard during side posture lumbar manipulation is believed to originate from the zygapophyseal joints. And according to a recent study by Bereznick DE et al the average refractory period is 68.33 minutes.

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