From what I understand there is no way to know until it happens. Something we both would like to avoid. Post-op PSA could have a fast doubling time and it could be very slow even with your Gleason 9. I have seen little correlation other than to say higher Gleasons tend to have faster doubling times.
Advanced Prostate Cancer at age 44 (I am 48 now)
pT3b,N0,Mx (original PSA was 19.8) EPE, PM, SVI. Gleason 4+3=7
Da Vinci Surgery ~ 2/17/2007
Adjuvant Radiation Therapy ~ IMRT Completed 8/07
Adjuvant Hormone Therapy ~ 28 months on Casodex and Lupron.