n. 25B6; noun
he made an exceptional contribution during his lifetime : LIFESPAN, life, days, duration of life, one's time (on earth), existence, one's career.
the lifetime of workstations : DURATION, (active) life, life expectancy, functioning period, period of effectiveness/usefulness.
it would take a lifetime : ALL ONE'S LIFE, a very long time, an eternity, years (on end), aeons; informal ages (and ages), an age.