The concept of "life's durations" can be expressed in a variety of ways using different synonyms. Some possible alternatives include "life expectancy," "mortal existence," "human lifespan," "length of life," "duration of being alive," and "time on earth." These all express various aspects of the length and quality of human life, from the statistical average to the personal experience. Depending on the context, other synonyms such as "lifetime," "vitality," "healthspan," and "longevity" may also be relevant to the discussion of life's durations. Ultimately, the choice of words will depend on the intended message and audience, but the many synonyms for life's durations offer a rich array of options.