I understand now. You are using "Stability Analysis" part of the platform. Stability analysis is a special application of the general degradation analysis. Its behavior is tailored to suit the special need of stability analysis. The "Prediction" column that you see is already the crossing time of the confidence interval line with the threshold. And it is lower one-sided. The actual crossing times of the degradation lines with the threshold are not reported, because they are not the interest of stability analysis.