I thank you for your answers. I think for my saga, I will use the following interpretation, which is roughly the middle ground. I think it’s reasonably close to RAW.
You may only gain XP from one source at most. The only exception is if you go on multiple adventures, in which case I would probably give 10 Adventure XP total.
You may engage in other activities, including one ‘season-long’ activity. My justification is that if it’s a short adventure, you don’t spend the rest of the season alone in a room, thinking “Well, what did I learn?”
For example, assume someone goes on a quest to recover a lost scroll in a catacombs. The adventure takes only a weekend in the Spring. You take adventure XP. You may not gain any other XP.
Additionally, you may not do the following activities:
-Study a book to gain XP.
-Study from vis to raise your Arts.
-Gain XP from being taught, such as by attending university
-Gain XP from being trained, such as by working as a carpenter’s apprentice.
I feel like the last two are thematically appropriate—the carpenter’s apprentice might get thumped on the head for not having his head in the game. Likewise, the university student pondering his adventures will fall behind on his Artes Liberales studies and may fail the exam (represented by his having a lower Artes Liberales score than his peers at the end of the season).
You may do the following activities, assuming you forego all exposure XP for them.
-Write a tractatus.
-Copy some books
-Engage in Laboratory activities such as inventing a spell, fixing an Arcane Connection, or extracting vis.
-Teach a class at university.
-Earn a living as a carpenter, including making good quality items and selling them as part of your normal income.
-Earn a living as a carpenter, including training your apprentice.
-Participate in drills at the covenant, if you are a grog. You will not gain any XP, but you will still 'keep current' in terms of fighting as part of a trained group.
-Administer your estates and participate in court intrigue, if you are a noble. Your fortunes will not decline, since you’ve spent most of the season attending to your affairs.
For anything involving being a source of advancement (teaching, writing, training), the source quality is unaffected.
Does this sound fairly reasonable?