I 'accidentally' clicked quickly through the default installation because I'm a windows user and thus trained to click 'next' as fast as I can to get through the extensive amount of obligatory install prompts every single time I want to install something.
Unfortunately I had no internet connection at the time and the install just froze. If I hadn't been logging on to the forum here (from another computer) and started writing about it, I never even would have discovered that there actually was a timeout. It must've been 10 minutes or something.
I think 10 seconds is more than enough for the installer to figure out whether it can get online or not :)