OOCly, we simply click a few buttons and Graviton Physics is set to train to level 5 over the next month.
But what really happens IC? Are we really to believe that our characters sit down with a book about highly complicated and advanced graviton physics and learn it down to a razor's edge over a mere month? My guess is no. Instead, I assume there is some sort of neural uplink going on.
What follows below is my imagination at work. If anyone has PF to correct me with, please quote and link it.
I think Capsuleers are given access to a vast library of information on one topic, probably provided through some centralized computer network owned by CONCORD or the Big Four. When we buy 'skillbooks', we aren't actually buying books. We're buying an all access pass to that section of the electronic library. Over the course of the training time, we are either consciously or subconsciously fed the appropriate learning material through our neural links 'Matrix style'. Remember the part where Neo closes his eyes for a few seconds, then wakes up with all sorts of panting... "I know Kung Fu!". That's what's going on here, only at a slower rate, maybe.
The expense of the access passes are likely related to the size or importance of the information being bought. For example, the skills to fly a frigate are far far less complicated or dangerous than the skills required to fly a carrier. You're paying for several entire mainframes of information to fly that Thanatos, but you only pay for a couple hard drives of info for that Atron.
Now, I assume this technology is also available on a much smaller and less secure/safe scale for non Capsuleer skills. I assume some upscale bookstores would sell a very very small selection of access keys to their own library of electronic books. Sortof like Amazon Kindle. You can order cookbooks and learn how to bake bread, or you can order a book about swimming and learn how to swim. Or maybe Kung Fu, like Neo?
These smaller scale skills would not take as long to train, being far less complex. They may only take seconds to train. The cost would be pretty excessive for anyone but the most wealthy, where it would be far more cost effective to just buy a holobook and read the damn thing. But for us, time is a precious resource, and money is not. So we can train up how to go skiing at a double diamond slope in about thirty seconds.
Of course, for mundane things like this, practice does make perfect. Just because you can fly a Zealot doesn't mean you'll be any good at it. Same with cooking, or skiing, or kung-fu. So, people would be able to effective 'read a book' in a few seconds flat, but they still need to apply that knowledge, or learn how to apply it in practical use.
That's about all I've got for now. What does everyone else think?