時間 - スパンと期間

from a time that has begun a long ago

何年も前から

at a point in time as a process or action continues or is being carried out

将来

a work day that is short compared to total hours of most jobs

短い労働時間

in the end of or over a long period of time

長い時間が経ってから

used to describe a prolonged or indefinite period of time, often implying that something will continue for a very long duration

永遠に

to last only for a short period of time

used to refer to a long passage of time or a significant number of months or years

長い時間が経ってから

at an unspecified point during a series of events or a process

不特定の期間が経過した後

a very prolonged period of time

長い期間

used to say that something has existed or been done for an extremely long time, to the point where its origin or beginning is unknown or forgotten

古代から存在するもの