长时间for a long time
我等了你好久了。
I've been waiting for you for ages.
我等了好久，你也没有来。
I waited for a long time but you didn't come.
我好久没有看见他了。
I haven't seen him for ages.
多久<方>how long
这要学好久才学得会？
How long do you need to study this before you pick it up?
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