a person or thing that excavates. 2. a power-driven machine for digging, moving, or transporting loose gravel, sand, or soil. 3. a sharp, spoonlike instrument used for scraping out diseased tissue, as in dentistry. Origin of excavator. 1805-1815.
If it is a permanent tattoo, then it would last on the bottom of your toe forever. If it's a temporary tattoo, it would probably only last a day or two.
If your other question was how long do the tattoos last on your feet, the obvious answer is forever, but the feet are more likely to have ink migration and line blurring. It's super delicate skin. I put sunblock on mine anytime I wear flip flops. I take it with me for things like outdoor concerts, picnics and the beach.