If the alternator belt is broken, the battery light in the instrument will light up first, and the high beams will dim significantly at night if the battery is in good condition and electrical appliances (lights, air). air conditioners, etc.) are not on much, you can probably drive for about half an hour.
However, the generator belt on many models also drives the water pump, compressor, etc., so the engine may start to boil and water will come out in less than 10 minutes of driving if the water temperature is high. too high once the motor boils, the motor will stop automatically. Additionally, there are also situations that can cause the engine to overheat.