How long do beats last?

Beats typically last for a specific duration defined by the tempo of the music, measured in beats per minute (BPM). In most modern music, a beat is usually a quarter note, which lasts for a fraction of a second, depending on the BPM. For example, at 120 BPM, each beat lasts half a second. However, in musical contexts, the perception of a beat can vary based on the style and rhythm.