I have a lurking suspicion that _Leonidas W_. Smiley is a myth; and that my friend never knew such a personage; and that he only conjectured that if I asked old Wheeler about him, 

it would remind him of his infamous _Jim Smiley_, and he would go to work and bore me to death with some exasperating reminiscence of him as long and as tedious as it should be useless to me. 

没有搞懂as long and as tedious as it should be useless to me...其中有3个as：

哪两个as是属于as...as比较结构？ 还有一个as是什么用法和含义呢？