noun
General term for time as a concept, duration, or a point in time. Used in many common expressions.
時間が経つのは早い。
Time passes quickly.
もう時間がない。
There's no time left.
noun
Specifically refers to a period of 60 minutes, or used when counting hours.
ここから駅まで一時間かかる。
It takes one hour from here to the station.
三時間待った。
I waited for three hours.
noun
Used for a scheduled block of time, especially in educational contexts like a class period or lesson.
次の時間は数学だ。
The next period is math.
英語の時間に遅れた。
I was late for English class.