Finally, let's look at expressing spans of time. How many hours (時間), how many minutes (分), and about how long (くらい・ぐらい).
■ 時間: This means "time" in general as well has "hour."
You probably know how to ask the time and give it:
What time is it?
It is one o'clock.
But adding 間 (space; interval) gives us a span of time.
When will you return?
(I) will return in (the span of) an hour
I study Japanese for two hours every day.
■ 分: This means "minute", a unit of time. As mentioned previously, the pronunciation is ふん, it can also be ぷん depending on what number it follows. Here are the "pun" pronunciations:
As mentioned previously, these patterns just repeat themselves. So, if you want 11 minutes, it is １１分. And 18 minutes can be either １８分 or １８分.
■くらい・ぐらい: This means "about", and, once again, the pronunciation can change depending on the speaker.
Unlike 分, the sound change isn't standardized. While there were historical reasons for one or the other, today, the difference isn't clear and くらい and ぐらい are pretty much interchangeable.
About two hours
The test takes about thirty minutes.
to kill time
to waste time
to not have time;
to run out of time
every other day