A little cross-posting here, because of so many threads on this topic.
Here's a report on my 3-month follow-up:
I appear to be leaking about an ounce a day now; at the visit, the doc said that's good. He said that I will probably see continued improvement over the next 3 months, and that after about 6 months there will probably be little if any further change (without surgical intervention at some future point, which I don't plan to do, even if I'm still leaking an ounce a day after six months).
I asked about the nerve-sparing: he said that the nerves are related to erectile function but not to urine control. (It's odd that these docs disagree on so many things: in the other thread, someone reported that his doc said that the nerves affect continence.) In my case, the surgeon had to take out the nerves on one side because the cancer was up against that side of the gland, but he was able to spare most of the nerves on the other side. He said that the sides have some redundancy, so I may recover erectile function (or at least some percentage of it). Given my age (70), he said I'd be a superhero if I had recovered most or all of it by now.
At this point, I'm just happy to be rid of the cancer, which was Gleason 8. The doc estimated about an 80% chance of no recurrence in my case, and that feels like good odds.
After getting a tip in another thread about measuring, I got out my old postal scale (which is so old that its first-class letter rate is 13 cents for the first ounce and 11 cents for each additional ounce) and weighed my pull-ups before and after. It turns out, if I did the arithmetic correctly, that a fluid ounce (U.S.) of urine weighs just over an ounce, so it was just a matter of weighing and writing the number down. It was useful to have a number to give the doctor. And it's helped me feel confident enough now to switch, when the pull-ups box is empty, to guards or pads.