Departure Board
Drag the arrival and watch the hatched connection bar push the answer to the next departure.
A service every N minutes is three values: the gap between departures, a start and an end. The end is never a departure. The window is half-open, so a shuttle every 20 minutes from 06:00 to 09:00 leaves last at 08:40.
Worth trying: arriving exactly at the end of the service window leaves no departure, and that is a correct answer, not a failure. Then the ferry list with no connection time: the 10:30 is made, and the connection time changes nothing.
Reference: nextDeparture
finds the departure and
scheduleDelivery takes it
on. See the guide’s
next departure section,
and the Connection Checker for one handoff’s
handling time.