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The corporate salaryman isn't 100% of Japanese adults as it sometimes seems in these threads. It's somewhere around 20% to 30%, as it is for white-collar jobs everywhere.

There’s another rush hour between 9 and 11 pm.

Another way to confirm this is to compare with the morning rush hour. Way more crowded as most people start work at around the same time (most companies have a starting time of 9 or 10 am).

I can confirm. I used to live in Kawasaki in 2010 and I regularly visit Japan from California for vacation and business. The morning rush hour is relatively short (roughly 7am to past 9am) but intensely congested due to the fact that most companies start work around the same time, and lateness is verboten. However, the evening commute is not as sharply congested, although it can still be standing room-only on the trains. The evening commute begins as early as 5pm but could last until the last train, typically around midnight. This is not only due to people working overtime, but also due to coworkers and colleagues going out at night for drinking and other activities. This was a regular occurrence for my colleagues and me back when I was interning at a Japanese company a decade ago in Kawasaki.

I... don’t think the rush hour really ends until somewhere around 11pm.