I've put in around 100 hours over the course of the past few months...

Though I didn't REALLY get into it until career mode appeared and I had to try to accomplish goals with a restricted set of parts.

I maxed out the science tree and just this week finally got around to landing a Kerbal on Eeloo and getting them back home.

The challenges still remaining for me are landing and returning from every possible celestial body (such as Lathe and Eve), but assuming I'm able to complete them I don't see how I could put 800 hours in...

Maybe if there was some reason to construct space stations or surface bases... (or obviously interstellar travel)

How have you managed to put that much time in on the game? (Uh.. hope you get notified about this reply...)

Although in an ideal world there would be no need to dual-boot, I'd definitely be less annoyed with a Linux / DRMLinux dual-boot system than a Linux / Windows dual-boot system. Presumably a Linux kernel with DRM baked in would still be more secure than Windows and Microsoft wouldn't be collecting money from game enthusiasts anymore.

Or you can just right-click the start button (from the "Desktop" interface).