life-time

/L AY1 F T AY1/
noun
  1. 1

    The duration of the life of someone or something.

  2. 2

    A long period of time.

    โ€œI've been waiting a lifetime for a train.โ€

Source: https://en.wiktionary.org/wiki/life-time, https://en.wiktionary.org/wiki/lifetime