시간 - 기간 및 기간

from a time that has begun a long ago

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

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

in the end of or over a long period of time

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

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

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

a very prolonged period of time

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