I'm no expert on the realities of travel in Kenya (though I speak for many in that we look forward to reading about yours), but you'll hurt yourself before you'll hurt a well-maintained TW.
These are continuous, nonstop (aside from fuel stops) miles at wide open throttle on U.S. highways in 100F+ (38C) heat. 1677 of your kilometers. As far as the engine goes you won't hurt this bike, if that is your concern:
Please take lots of pictures of your trip and post them here.