The illusion of an objective standard psa, sgc, bvg

[AGuinness]

The whole TPG thing raises some questions, and forgive me if they are rudimentary and/or been asked elsewhere. But I'm curious if these answers are public knowledge or not...

I've often read people noting the brief amount of time graders spend looking at a card, but do we know how long a grader averages per card? Do graders spend more time on certain sets/cards?

What would the ideal amount of time be on a card?

Do graders go over every aspect of grading (centering, corners, edges, surface, etc.), or do different graders specialize in a limited number?

At what threshold does a card merit multiple graders, or does every card get multiple looks?

I would assume that not all graders get to grade all cards, but that some graders focus on certain sports, eras or sets, is that right?

Are graders ever publicly identified (I don't think I've ever read of one being named)?

I would assume that qualifications vary, depending on how the grader would fit into the company, but is there a test for employment?

How are graders evaluated by their employers?

Just a few thoughts that run through my mind on the topic. If anybody has solid answers, I'd appreciate sharing the knowledge!