What is the term for the time it takes a magnet to complete a revolution?

The term that defines the time it takes for a magnet to complete a revolution is known as the "period." The period refers specifically to the duration of one full cycle of a periodic event, which in this case is the magnet making a complete turn.

In this context, frequency, while related, measures the number of complete revolutions or cycles occurring in a unit of time, typically expressed in hertz (cycles per second). Thus, while frequency and period are connected concepts, the question specifically asks for the time duration, making "period" the appropriate term.

The term "cycle" refers to one complete sequence of the event, but it does not denote the time aspect of the motion. "Rotation" describes the act of turning around an axis but does not specifically indicate the time it takes for that complete revolution. Therefore, identifying the correct term requires focusing on the concept of time associated with a complete rotation, which is the definition of "period."