The phrase "time flies" is often used to express how quickly time seems to pass. However, there are many other synonyms and idioms to convey the same idea. For example, "time flies like an arrow" or "time passes quickly like sand through an hourglass." Other phrases include "time slips away," "time marches on," or "time of your life." These expressions emphasize the fleeting and finite nature of time, reminding us to appreciate each moment and make the most of it. Whatever the phrase, they all remind us to enjoy life and cherish our precious time before it passes us by.