What starts with "P", ends with "E", and has over 30 letters?

Why this works

This riddle plays on the expectations of the words “starts with” and “ends with,” leading you to think of a single word. However, the key lies in interpreting “over 30 letters” not as characters in a single word, but as the postal letters that the Post Office handles. So, "Post Office" fits perfectly because it begins with "P," ends with "E," and is a place that indeed manages a large number of letters daily!