千せん年ねん一いち日じつ

noun

unchanging for years; same old routine for ages

Describes a state or activity that continues without change for a very long time, often with a nuance of monotony or steadfastness. Relatively rare and literary.

• 彼かれの生せい活かつは千せん年ねん一いち日じつのごとく変かわらなかった。

  His life remained unchanged, as if a thousand years were a single day.