"Learning skills" are the skills that increase a character stat, thus reducing the time it takes to train other skills that require that stat. This creates a trade-off. I can learn skill X now, taking the "normal" amount of time to train it, or I can train the learning skill now, and then train skill X, which will now take slightly less time.
My question: what is the "payoff" time for each learning skill - how long do I have to spend training skills utilizing that boosted stat before the total training time is lower than it would be without the learning skill?
Ideally, I would like a chart that lists all the payoffs for all levels of all learning skills.