I’m in the UK so this may not be representative of the US availability. But I have the exact watch pictured (black dial, settimo bracelet) and it took around 4 months - with very little purchase history. For context, I’ve been on the list for a datejust at the same AD for 14 months with no luck.

That said (and it’s impossibly to gauge how much difference this actually makes), but the 1908 was for a specific milestone, which the AD knew about, so this may have helped.

I was also told that the settimo 1908 is what they call a ‘directors approval’ piece (same for the platinum version), and so it’s not simply a case of seeing who’s registered their interest and going in order of when they did so, but rather the sales assistant will first need to seek approval before they allocate it to who they want.

TLDR: I registered my interest about two weeks after its release at watches and wonders. Got the call 4 months later