gives the expected end-to-end transit time for domestic priority letter-post items. Usually, it is one (J+1), two (J+2) or three (J+3) days. If different standards apply for different routes within the
country, then the shortest one is chosen. Similarly, if multiple standards apply for the same route (e.g. J+1 "speed" and J+3 "reliability") only the shortest one is indicated.