Calculate whether an event is still on time
Record the planned and actual duration of each completed segment. The difference is cumulative schedule drift. Add the recovery reserve that remains in the published schedule to see whether the event can still finish as promised.
Use drift as an operational signal
One late segment does not require an immediate cut if the schedule has enough reserve. When the reserve goes negative, the projected finish moves. That is the point to agree on a recovery action and communicate it to the crew.
Keep the next decision visible
Open the planned segments in TimedFlow so the controller and viewer share the same timing state. The calculator remains available as the producer’s planning view while the live timer handles speaker-facing cues.