I work on my tiddlywiki coding and internal information page that our field guys use all over the world.
Or I get more familiar with the features and workings of autohotkeys, and improve my own AutoHotKey.ahk file shortcuts, hotkey replacements, etc.
If I have a little extra time, then I’m working on MS Access development, since I’m the only one in my neighborhood that does much of anything that’s not strictly an Excel flat file, and I maintain several crucial databases.
If anyone sees that I have extra time, then I get asked from one to a slew of questions about Excel functions or problems (and sometimes I learn something from the question, or from trying to find an answer; those are good days).
Or I might just backup my hard drive and read a book, or catch up on one of my thousands of unread emails.
But I do like spending time here, too, or Facebook, or Yahoo, or Motley Fool or Charles Schwab…