Three years ago, I had to teach this summer corporate class for Samsung Electronics through my university. Pay was great, but the hours were horrible. 8~11am, then 8~11pm. And it was so far from my home that I would have wasted about 5 to 6 hours of my day commuting there twice. So I rented a room for the weeks I was there. The pay for these classes was awesome, and the room was cheap. So there was that.
Anyway, officially we were supposed to start at 8:00, which meant I had to be there by 7:45 or so. But the workers were usually just getting off their shift, and never made it to the classroom before 8:30 or so. I got a lot of reading done while waiting around in that classroom for students to show up. Played some classic Nintendo games on my phone emulator (to prevent corporate spying, there was very limited internet access), and for a few days, drawing dungeon maps on this little pocket graph paper notepad I'd found.
Quite a few of them are Asian fantasy themed, since I was working on Chanbara at the time.
I found that mini graph paper pad today, and the maps are still in it. That will save me some time while putting together my new Chanbara campaign. Just need to stock these locations and decide where they are on the area map.