2003: gleason score 7 (i think), same operation & one node except chemo included, never got beyond a few pads a day, tapered to one a day by 3-4 months, then zero for about 2 years. Judging by my support group, it ranges from almost nothing-to-full diapers for years. Same for this forum.
It's pretty individual.
Had neurosurgery for brain growth (Mengionoma, not spelled right) and it was diapers for 3-4 months, now down to 2 pads a day (mostly), but amount tapering. Certain physical movements/exercises cause . "squirts". Certain liquids have had to reduced or used only in morning, urge can get actually painful.
Again, it seems to be highly individual. Some do seem to at least taper to less with time, time varies considerably.
Good luck. You are in the right place.