How To Treat Reappearance Of Kidney Stones Despite Undergoing Surgery?

Sir I have operated my wife in Oct 2014 for Kidney Stone as per doctor they have removed the kidney stones. But Tomorrow i have done a Utrasound Scan for the same. There were three kidney stones there i.e. of One is 10 mm and 2 otheres are 4 - 4 mm. I want to know how much time a kidney stone take to develop after operation