I once had a candidate submit a 20 page(!) resume. They were so full of themselves. That one I actually did spend 5 minutes with to see what they found so fascinating about their history, but it was otherwise an instant reject.
A 20-page resume bespeaks someone inexperienced in job applications.
One of the important skills I would be looking for in a recruit would be the ability to express themselves clearly, concisely, and persuasively. Clarity and conciseness are marks of the ability to think. Persuasiveness is actually something that makes me suspicious, but in many jobs the ability to persuade others is an asset (leadership positions, for example). So YMMV.
I've always struggled with conciseness; I'm in love with the sound of my own voice.
In some industries (or academia) a 20 page resume listing every project, publication, patent, etc. is considered normal and desirable. If could be that case.
