No, that would be so much broader. For example, you can take exposure in PM any season just because you do it twice a day, but you're really not using it the the sort of full-season effort that is intended by the statement. I think we all agree this is way too much.
How do you get that from what I wrote? Now, I maybe wasn't specific enough. You need to be using it over the whole season to do your work, right? For instance, a blacksmith might bargain some, but that wouldn't be a major part of their work.
But for the mage, when working in the lab they would be using Magic Theory for 10 hours a day, mixed with a Form and a Technique, in order to do their productive work.