A heartbeat lasts for approximately one second.
A complete heartbeat, also known as a cardiac cycle, encompasses the contraction and relaxation phases of the heart. This process involves the atria and ventricles working in a coordinated manner to pump blood throughout the body. The duration of this cycle, and therefore a single heartbeat, is typically around one second. This corresponds to an average resting heart rate of 60 beats per minute. A faster heart rate would shorten the length of each heartbeat, and a slower heart rate would lengthen it. The time it takes for the atria to contract, the ventricles to contract, and the heart to relax all contribute to this approximate one-second duration.
