That's why I said this'll vary from saga to saga: The demographics of the order tells us nothing about book production or exchange, which allow for sagas where the order cooperate fully and produce a lot of books, and sagas in which magi seldom write on the arts and keep their books to themselves and their mates.
Even in a given saga, this may vary if you're a mercere or an Ex Miscellanea, what's your tribunal, what's your covenant, its relationships with other covenants...
So no, even if 82 may be very little in some sagas, it will still be way too much in others.
For an exemple, check the Practicia Covenant, which, even if it is a "theoretical" covenant, has its member study an awful lot from vis. In such a saga, vis-less vis study would be awesome.