jokes aside, people need to calm the fuck down. Like this dev has always done this, massive update and fkn ages until the next one.
While I get this one has been extremely long, they are doing animations now (or at least that is what I heard), so makes sense that it more than doubles their production time... cause well before they were doing stills. And animating...
So lets be conservative and say 12fps with a 3 second loop, that is 36 frames per pose, so lets say 5 poses per scene, which makes 180 rendered images, and that isn't including the cumshot (if it is animated), and isn't including the non-pron renders.
That is 180 renders per scene, when previously it would have only been 5-15 (up to 15 cause different angles of the same pose, we ignoring different angles for animation to keep it simple), so that is 180/15, which is 12 times more work on renders alone for this update, so however long it used to take for the rendering stage times it by 12 (and this is conservative).
Now this is if doing it bit by bit same way, there are ways to speed up the process and streamline it, but would still take way longer.
However.... if they doing animations... they aren't just doing it for new scenes... they gonna do it for old, so then you also have to take that into account as they go back and redo all the original content. (it is basically a remake at this point sex scene wise).
And that doesn't even touch any code touchups or stuff under the hood, this is purely on the CGs..... So yeah, a year and a half for that monumental amount of work... not the worst, most devs would produce not even half of that in the same time frame, but people praise em for it because they release incremental updates.
Stencil just unloads everything in a path at once on you so you don't have to wait once you get invested into that path that you just started cause guess what, is already finished.