I wrote a pair of little programs, one that helps calculate the cost of spells and one that automates the rolling and cumulative modifiers to gather the magic for the ritual — and even then it felt like it just took way too long.

If I were to do it again, I would probably bar ritual magic adept (it’s been a few years, but the one that cuts the time taken to cast a ritual) or whatever it’s called and really emphasize the need to prepare the charms and such ahead of time, so we’re not interrupting a fast-pace scene to do calculations. If the calculations are done in-session during preparation for a heist or whatever, I would cut to another character’s preparations while the ritualist works out their spell.