888.888... miles per second.
That's 0.477 percent of the speed of light.
Just to point out it's fast but to get real astonishing time dilation matter needs to be closer to 70% plus of the speed of light.
Still the time delta between us and orbiting GPS satellite is enough to throw off GPS by a hundred miles and more as error accumulates, and they are significantly slower.
It takes an algorithm to factor in the Lotentz transformation for time dilation to adjust for relativity for accurate GPS.
We still don't want anything like that anywhere near our solar system.