If the functioning adenoma has been successfully removed?

A 53 year old lady is diagnosed with primary hyperparathyroidism. Her serum PTH levels are elevated. A surgeon performs a parathyroidectomy. How long will it take for the serum PTH levels to fall, if the functioning adenoma has been successfully removed?

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  1. 6 hours
  2. 24 hours
  3. 2 hours
  4. 10 minutes