EMG exams take about half an hour to an hour, and may take longer for more complex disorders. EMG is an important ancillary test of the nervous system and is mainly used for the diagnosis of peripheral neuropathies, nerve-muscle junction and muscle lesions. EMG includes conventional electromyography, motor unit counting, and single-fiber electromyography; the neurologist uses concentric needle clicks to record various electrical activities in the quiet state of the muscle and in different degrees of random contraction. The duration of EMG is not entirely consistent from patient to patient, depending on the number of specific nerves and muscles to be examined, the clinician’s consideration of disease tendencies, and the operator’s technique. If the patient’s condition is relatively simple, the examination can usually be completed in about half an hour to an hour, but if the patient’s condition is more complex, the examination time may need to be extended accordingly. In view of the importance of EMG in the diagnosis of neurological diseases, EMG is performed by neurologists who have undergone systematic training and rigorous training and who have extensive clinical experience.