Note that this only considers UUIDv4, the random UUID. Other forms can generate UUIDs that are much closer together. For UUIDv7, UUIDs generated within the same millisecond will have identical 48 bit prefixes (or up to 60 when the monotonic counter from section 6.2 is used).
https://www.rfc-editor.org/rfc/rfc9562.html#monotonicity_cou...