Constant MIN_RATCHET_ROTATION_INTERVAL_MS 

pub const MIN_RATCHET_ROTATION_INTERVAL_MS: u64 = _; // 1_800_000u64

RNS 1.4.2 Destination.RATCHET_INTERVAL: the minimum time between minting new ratchet keys. Rotation rides the announce. An announce inside the floor re-carries the newest ratchet instead of minting another.