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Definition of lifetime : The time that life continues.

Synonyms:

life-time, life sentence, lifespan, permanent, continuing, animation, living, aliveness, life story, liveliness, live, sprightliness, spirit, biography, span, life, existence, life history

epoch, duration, period, generation, oldness, lastingness, eon, longevity, era, age, time

month, second, century, decade, millisecond, day, minute, millennium, hour, term, microsecond, week, year, semester

everlasting, enduring, lengthy, interminable, livelong, lifelong, perpetual, long, eternal, incessant, long-life, prolonged, durable, lasting, perennial

Usage examples:

• " Sometime even before Tebron's lifetime. - "Warlord of Kor", Terry Gene Carr.
• I was still more of a fool not to have put her out of the way, knowing what she did- but as I remarked, that was the mistake of a lifetime. - "The House by the Lock", C. N. Williamson.
• No man can tell until he is moved by the Divine Spirit what he may do, or how he may change the current of a lifetime of fixed habits of thought and speech and action. - "In His Steps", Charles M. Sheldon.