On the geological time scale that is sort of medium fast. Rivers change their courses over ~5 million year time scales. Continents split and crash together over ~200 million year time scales. Titan will lose its lakes in about 300 million years.

Mars has changed so little in the last 3 billion years that the Phobos breakup is like a daily headline. Of course, we will land on it in the next few years and probably disassemble Phobos over the next 1000 years, so this all might become moot soon.