Today I did my first 20-miler since probably 2006 or so. I rode from home up to the university, which is almost exactly ten miles. I blocked out two hours for the trip, which was just about right, as it took about 90 minutes because I had to stop twice and rehydrate. Highway 1 has a couple of grades that really took it out of me, plus the heat index was up around 115 degrees Fahrenheit.
I got to the school and taught my lesson, then ran some paperwork over to the annex so I can get paid for my work on the high school summer program, then saddled up and headed back home. This time I decided to cut over and take Highway 15, which rolls in front of Shinagawa. This was much better. For one thing, there's a net elevation gain between Kawasaki and Minami-Azabu, so I was largely going uphill heading north. Highway 15 doesn't have much in the way of steep grades, just a relatively steady downhill on wide streets and sidewalks that made things pretty easy. I only had to stop for lights and I was able to easily avoid the pedestrians who suicidally insist on lunging out into the sidewalk without looking in either direction. It only took me about an hour to get home.
I think the next purchase is going to be some riding gloves, though. My hands are pretty sore from leaning on those bars all the way.
Tomorrow I don't have to be anywhere until 7 PM, so I'll probably go for a ride around town here somewhere, then come back and work on my grad school checklist. I have to fit that into my fall schedule so I have time to do that too.