30-32. The seats do feel somewhat cramped (similar to flying coach on a NW 747.) The seats do have personal TVs + basic video games. They are one of the few airlines that still has the CCTV showing exterior shots of the plane. Movies are a mix of Western and Asian titles. Not all titles have English Soundtrack and/or Subtitles, but most do.
The service is very good even in Y. Expect a lot more bowing and attention to detail. If you're alert you'll even notice they clean the restrooms during the flight.
Booze is free in Y. It's been almost two years since I've flown international coach on any airline, but back then adult beverages on JL were all top shelf. Scotch is 12 or 15 year, served from the large bottle, and better than the scotch you'd get in International Business on a US airline. Food is okay, nothing to write home about.
They do have a snack box in the sky full of goodies you can grab at any time between meal services.
Seatguru.com finally has JAL configurations. You can use that to find the best seat. If the loads are light the FAs may suggest an open row to stretch out in. However, I don't think has the same load issues as the NRT-ORD flight.