He has been waiting here for a long time.他在这儿等了许久。
许久的用法和样例：
例句
我们在长凳上休息了许久之后便慢步向博物馆走去。
After a long rest on the bench we moseyed up to the museum.
他过了许久以后才来。
It was long before he came.
最近，我的一个很好的朋友来看我，她刚从一片森林里散步许久回来，我问她看到了什么。
Recently I was visited by a very good friends who had just returned from a long walk in the woods, and I asked her what she had observed.
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