He has been in profession for as many years as you have. 他在这一行的年资和你一样久。——《多功能词典》P909

句中的 has been in profession、as many years as you have 学生我理解。这句话中介词for为何能下接“as many …years as…”， 它表何意未找到依据，请指教。

解答如下

这里as many as years 相对于一个时间段

He has lived here for as many as 50 years.

他住在这里时间长达50年。

Longstanding rules have stipulated that, if caught, such people can be fined $66 a day, up to a total of $661,can be detained for as many as 30 days.

一直以来，中国政府都有这样的规定，违反签证规定的外国人一旦被发现，每天将被罚款66美元，罚款总额最高为661美元，并可处以最多30天的拘留处罚。