Yes, Jonathan...narratives are built through reading. So that reading literature or getting a business degree can both build richness of narratives.....insofar as every academic endeavour, the way I see it, is basically a story. Even texts written to read, for instance, contain narrative. Frankly, narrative for me is opposed to mathematics. Now, even math contains narrative when a mathematician presents a paper..or develops a theory...

But returning to the issue of time. At the ESIT in Paris, first year students are often told to go spend a year in the country of one of SLs. This "year" of course is time. So, presumably,  one way of developing narrative is time spent in country. So, perhaps, one can distinguish types of narrative that might be useful. 

I think time is vitally important. For instance, a 20-year old may not know enough of a language to interpret from it. BUT, by the time they reach 30, they may . Many simultaneous interpreters get their degrees much later than students in other disciplines. I do remember a case of a brilliant girl at the ESIT who finished her two years straight. They did not require her to spend a year abroad. But they didn't give her the diploma either. Because they decided she was too young. In other words, she was good enough to "get the meaning mostly right" but she didn't have the maturity to understand what she was really saying...interesting, huh?

As for working/working on TL (for NS).  Most people, as they start./study translation or interpreting, do it almost unconsciously....it is hoped. They are told, for simultaneous high-level interpreting, that they must be au courant of everything around them. Obviously, the more one reads in that setting the more one develops TL speciallized knowledge. Right? So, you are not really developing language knowledge ie structures of for instance. You are really developing area knowledge (concepts and vocabulary). One already has the language blueprint as it were. You just building different types of buildings...for example, you would already know even the trickiest aspects of "standard structure" albeit "instinctively".....as most interpreters have already finished university when they begin to study interpretation. In other words, the specialized knowledge conceptually gets plugged into existing knowledge blueprint...which is for a NS is pretty well set....Philosophically, I'm interested in the knowledge issue....that too has not been very much written about. And of course, in my case, I'm interested in how the unconscious operates in all this...