Sorry to see this news. It will be the job of the onco to identify the optimum time to restart the hormones - some go for a specific number like pSA 5 or 10 while others will hold off for as long as the doubling time is more than 6 months. If the rise stays as slow as this, it might be a few years before you get to that point although as you know, for a man who was young at diagnosis the chance of the cancer being persistent and stubborn is greater.