The time rating of an electric motor is usually expressed in what unit?

Electric motors are commonly rated for their operational time in minutes. This unit is relevant because it provides a standard reference for how long a motor can run continuously under certain conditions before needing a cooldown or maintenance period to prevent overheating. While hours and seconds are also time measurements, they are less common for determining the continuous running time of motors within specifications. Days typically denote much longer operational periods, which do not apply to standard motor ratings. Therefore, minutes is the practical unit of measurement that aligns with industrial and commercial usage, making it the appropriate choice for conveying the operational characteristics of electric motors.