Make sure to use something that checks your time on the computer. It might be annoying, but it prevents stressing your wrists.
http://www.workrave.org/welcome/
is a pretty good (GPL) program that will tell you when to take a break. The commercial competitor of this program is being pre-installed on all laptops that our company uses, and I think it's even officially recognized by the Arbo services.
So if it tells you to take a break, you can point it out to your colleagues, sorry, come back in a minute or so.
Keep yourself in one piece till after Japan and the Con. And preferably afterward as well. ;)