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For how much time dup heart sound can be heard in one cardiac cycle

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Please find below the answer:

In the cardiac cycle, 'dub' or S2 is the second heart sound. It is produced by the closure of the semilunar valves (aortic and pulmonary valves) at the end of ventricular systole. This sound is sharp and high-pitched. It lasts usually for 0.10-0.14 seconds. 

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Heart sounds are the noises generated by the beating heart and the resultant flow of blood through it. Specifically, the sounds reflect the turbulence created when the heart valves snap shut. In cardiac auscultation, an examiner may use a stethoscope to listen for these unique and distinct sounds that provide important auditory data regarding the condition of the heart.
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