Good job! You might as well calculate the actual speed of the earth. Let it be only one million years old and we are already at a speed of 309264.48 times the speed of light. Nice cruise speed, isn't it?
Edit: I went fast and left the earth slow: with only 1 000 000 years (of 365.25 days,because of the leap years and still, ignoring the correction that takes place every 200 years) being accelerated at 9.81 m/s, the speed would be 1 032 647.913 times the speed of light ;-)
If these guys accept that the earth is 4470 million years old, well, 4470 times that speed. We could travel to the "end" of the universe in less than 5 years ...