Between ~6 weeks (lands right before a new beta is branched, beta is 6 weeks long) and ~12 weeks (lands right after a beta is branched, takes 6 weeks until the next beta, then beta is 6 weeks). Sometimes a larger feature that would stabilize just before a beta is branched will deliberately be held until after, just to give it some extra cooking time, though this is rare.
I don’t know off the top of my head exactly where we currently are in that cycle.
A new release is cut from the master branch every six weeks, and then spends another six weeks in beta before being promoted to stable. Assuming the stabilization isn't reverted, this feature will be in Rust 1.75, which will be released to beta on November 16 and to stable on December 28.
