Oh, and System->Preferences->Keyboard->Typing Break under Gnome, or workrave for Windows.
Being interrupted every 30-40 minutes is irritating as shit, but if you practice you can keep your flow alive by staring at the screen, keeping headphones on, etc. while doing stretches for a few (5 or so) minutes.
Being interrupted every 30-40 minutes is irritating as shit, but if you practice you can keep your flow alive by staring at the screen, keeping headphones on, etc. while doing stretches for a few (5 or so) minutes.