[nourishingvoid]

For frequent trains like like loop lines and subways in major cities, you can generally expect them to arrive when scheduled. These arrive every few minutes, so anything longer than a minute is perceived as a delay. These will be reported and apologized for.

For trains like JR that run longer distances and less frequently, delays of 15-20 minutes due to accidents or weather can happen. This seems to happen once every few months or so.