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The unit associated with magnitude but not direction is time. Time is a scalar quantity, which means it is described by a single value representing its amount, without any directional component. For instance, we can refer to time in units such as seconds, minutes, or hours, and this measurement solely conveys the duration of an event or condition without indicating any particular direction.

In contrast, the other units listed—force, velocity, and acceleration—are vector quantities. Force has both magnitude and direction, indicating not only how much force is being applied but also the direction in which it is being applied. Velocity also embodies both magnitude and direction, representing how fast an object is moving and in what direction. Similarly, acceleration conveys how quickly the velocity of an object changes, also specifying a direction.

Thus, time distinctly stands out, as it is solely characterized by magnitude, making it the correct choice in the context of this question.