posit that the thickness of the line of the moonapple logo be approx 100 miles, and that the lenght of the perimeter be around 4000 miles,
if the robot is 1 yard wide and can draw at an average speed of 1 mile/hour it will take it about 6 months of continuous running to complete the drawing (at 1 yard thick), and about 80,000 years to finish it as shown by TK2K (give or take 10,000 years).