How BorderHK works: the Security Bureau, Immigration Department and Shenzhen Port Office figures behind it, why a crossing time is shown in three parts, and why this is not an official service.
Sources: the Hong Kong Security Bureau, the Immigration Department, and the Shenzhen Port Office (i口岸).
Every crossing time is shown in three parts — the measured Hong Kong wait, the fixed transit leg between the two sides, and an estimate for the Shenzhen queue. They are never merged into a single number.
An unofficial service, not affiliated with or endorsed by the Hong Kong SAR Government or the Shenzhen Port Office.