for a long time

I have been knocking away for ages,but nobody has answered the door.

我已经敲了门好久，但是没人答应。

I haven't eaten meat for ages.

我已经好久没吃肉了。

A:Hi,Lily,I haven't seen you for ages,how have you been?

嗨莉莉，我已经好久没见到你了，最近怎么样？

B:Well,good,you?

很好，你呢？

A:I'm doing pretty well.

我非常好。