We would be going back to normal turns. This is very much an adventure that would require prep work. Also, if we're serious about the immortality thing as Mathilde gets on in years, well, the Mortuary Cult are some of the only people around who can bestow non-corrupting life extension through a well understood, reliable process. It's not a glamorous method, but the key term there is life extension. It's not a one and done ritual, it's a series of techniques which when combined will grant something approximating eternal life (as a husk), but can also probably buy us at least a few decades with relatively minor side-effects, before we need to start the really wacky stuff like mummification. The ravages of time and the quest for immortality being what it is means that most of the people who tend to have achieved it got there through very ethically questionable means, because those are the accessible paths. Necromancy, sacrifice, Chaos; ascension through magic is perhaps possible, but difficult.
The Mortuary Cult though? They were a state sponsored research project that worked on the problem systemically for generations.