I get the point that thaumaturgy takes time as opposed to the quick and dirty evocation arts, but how much time hasn't really been spelled out, unless I'm missing it. I've been coming up with my own scales, but I'd really like to know if it's spelled out anywhere.
My research so far has led me to the following conclusions:
From YW (Your World) pg. 261
The first is a matter of time. Thaumaturgy is a slow art, with the
fastest of spells taking a minute or more, and many taking much longer
than that. Patience is necessary; speed is being traded for
versatility and potency.
From YW pg. 262
If the complexity of the spell is equal to or less than your Lore,
assume you have everything you need to cast the spell and you require
no additional effort for preparation. If the complexity of the spell
is greater than your Lore, your wizard must enter a preparation stage
during which he researches the spell further, assembles the necessary
components, acquires additional sources of power, and finishes the
Also from YW pg. 262
Invoke aspects: Every aspect you can invoke to narrate a part of
preparation adds two shifts toward the deficit.
Make declarations: You can declare a mini-scene relevant to
preparation, where you use a skill and create a temporary aspect to
tag. When successful, this is worth two shifts toward the deficit. If
the effort fails, the spell isn’t automatically a bust, but no forward
progress is made, either.
Accept or inflict consequences: For every consequence you are
willing to take or inflict on others for the sake of preparation, add
the value of the consequence in shifts toward the deficit: so, a mild
consequence would add two shifts. (Blood sacrifice is a dark but very
potent path many a black magic practitioner can take.)
None of these take time, other than standard exchanges from what I'm reading. But reading on…
Also from YW pg. 262
Skip a scene – For every scene you can participate in during a session
and choose to skip in favor of preparing the spell, you can add one
shift toward the deficit.
So time in preparation is a bit nebulous in terms of scenes- I don't like leaving players out of scenes (unless they're really not there), but that's something I can work with.
Then with the casting- from YW pg. 270
In a low-pressure situation, you can go ahead and cast the spell
without making any rolls. It’ll all happen within the space of time it
would take to run a single scene of conflict—often less— as it’s just
a matter of a few exchanges to cast a spell.
So this seems to mean that no matter what, the casting of the spell is the equivalent of a single scene of combat.
So this is all, after all, very much nebulous, and I was wondering if that was the intent (and I'm doing it right just passing time as I see fit), or if there's something that I'm missing.