time

flash, instant, jiffy, minute, second, shake, split second, trice, twinkle, wink

bit, space, spell, stretch, while

escapade, lark, ploy

act, action, deed, doing, feat

episode, occasion

baptism, ordeal, test, trial, tribulation

enterprise, risk, venture

expedition, exploration, mission, performance, quest, stunt

cycle, generation, year

bit, space, span, spell, stretch, while

date, vintage

spell, stretch

span, tenure, term

hitch, tour, turn

half-life

age, longevity