Opening interrupts the programme conditions and may allow heat to escape. Frequent checking can therefore make a safe normal cycle take longer or change its estimate.
Understanding this situation
This does not mean a door should remain closed during an actual safety event. It means ordinary curiosity checks are different from following a stop instruction for smoke, burning or abnormal operation.
A useful next step
Let an appropriate safe programme follow its documented sequence. Inspect the result after normal completion. If a problem persists, record it rather than repeatedly opening the door to feel temperatures or expecting the original estimate to remain exact.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.