Alternatively, if you are constantly x feet above a spot on Earth, where x is the number of seconds since takeoff, we have a different problem. You'd be in a geostationary orbit above that spot, following the Earth as it rotates, no matter how far away you are. After about ~~~~10~~~~ 860,000 years, you are traveling at the speed of light, and this only increases. Hope your body doesn't impact Proxima Centauri.

Edit: Oops, I assumed an Earth day is 1 second instead of 86,000 seconds