Two and a half years ago, when I was first diagnosed, my oncologist did make a guess on how long ADT would keep my cancer castrate-sensitive based on his past experience, but the landscape has changed so fast that experience more than a couple of years old might no longer be valid. My onco team has since revised the number up a fair bit (I'm already past the original estimate and my PSA is still < 0.01 on the sensitive test).