RMSS rule book has a nice learning table in it. It list time required in training/study to gain a rank, be it rank one, two, three, etc. Just go to the table and add up the time required, then demand time spent in study, training, etc roleplayed in game.
Essense Companion list price of spell books and neat optional rules on use of spell books, learning without spell books, increased and decreased time with books and teachers, etc.
lynn