Some of the priests I know were recently given a sabbatical year (in both cases it wasn't for the sake of study - the priests ended their parish assignments lasting for many years and had time to think over whether to take another parish, enter a monastery or leave priesthood completely). When looking for details how sabbatical works for Catholic priests, I found a document concerning archdiocese of Seattle - this seems to expect the priest on a sabbatical to study some special program.
So here are my questions:
1) What does Canon law say about sabbaticals (link to particular canons + brief summary should be OK)?
2) What is up to the Ordinary? How usual is the linked policy, and how different is practice in other dioceses? What reasons for sabbatical are accepted (provided that other requirements have been met) in most dioceses, what in some and what almost never?
I'm interrested especially in situations like that of the two priests I mentioned, but any other information about priests' sabbaticals is welcome.