An automatic finish-time programme uses the oven's clock as its reference. A wrong clock can shift the schedule even when the duration is entered correctly.
What the observation means
Daylight-saving changes and power interruptions are common points to check. A minute minder measures an interval, whereas a finish-time function refers to a time of day; they are not interchangeable.
A useful next step
Set the clock according to the manual before arranging a suitable timed programme. Do not leave perishable food waiting during an unverified delay. If the clock repeatedly loses time or resets, record whether other settings disappear and request assessment rather than repeatedly compensating with a deliberately incorrect finish time.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.