At a glance
Mean elapsed time from first carrier scan to delivered scan for Japan Post shipments over the trailing 30 days, compared against the prior period. It is the door-to-door speed customers feel, blended across domestic Yu-Pack and international EMS. The alert fires above 5 days, which for a mostly-domestic Japan Post operation signals that something has slowed the network or that the international share has grown.
What it tracks
The card measuresdelivered_scan_timestamp - first_scan_timestamp per shipment, averaged over the rolling 30-day window with a period-over-period comparison, and counts only consignments with both a first scan and a delivered scan (in-flight parcels are excluded until they land). Domestic Yu-Pack within Honshu typically clears in 1 to 2 days; Hokkaido, Okinawa, and remote-island (離島) lanes run longer; EMS to the US, EU, Australia, or elsewhere in Asia adds international line-haul and customs dwell, so it can run 3 to 7 days depending on corridor. Because the figure is blended, a rising international (EMS) share lifts the average even when each lane is performing normally, so read it alongside the service mix. The >5 days alert is the prompt to separate a genuine slowdown from a mix shift. When it trips, check Late Shipments for the contractual miss count, OTD by Route for lane concentration, and Shipments with Tracking-Event Gap (24h domestic / 5d EMS) in case missing scans are inflating the measured duration. Scan timestamps are carrier-local (JST at origin), and tracking-event ingestion can lag, so very recent deliveries settle into the average over the following hours.