Maybe he's been around long enough to know that commodity price spikes don't last more than a few years. 第一句是三个副词接在一起吗？around long enough？ 

【答】没错。around 是副词，long 也是副词，enough 也是副词，修饰long。

注意这些最基本的用法：

He is around（副词）. 他在附近。

He didn't stay long（副词） enough（副词）. 他呆的时间没有足够长。

He says he didn't stick around long enough to notice any health benefits.

【答】结构：...（谓语动词）long enough to do ...（结果状语）。