The heating time for a Walnut Hollow wood burner can vary depending on factors such as model type and voltage rating. Generally, most Walnut Hollow wood burners require approximately 3-5 minutes to reach their optimal operating temperature once they have been plugged in and turned on. However, it is always advisable to refer to your specific model's user manual for accurate heating time information as different models may have varying heating capabilities and requirements. It is important to allow sufficient time for your wood burner to heat up properly before attempting any wood burning tasks for optimal results and safety precautions