The question of the emergence of the duration of an event by the movement of the present (the moment "now") in time is considered. The analysis of the dimensionality of the velocity of time motion is made. Based on the differences in the motion of matter in time and in space, the conclusion of the abstractness of time as the duration of an event and reality only in the present is obtained. The abstractness of the concept of time, allows in the duration of an event, to choose any moment as a point of reference. The natural point of reference is the present. The present divides time into past and future. A variant of the present, as a period of transformation of the future into the past, is considered. The sum of transformation periods creates the duration of an event, which is usually called time. It is concluded that it is impossible to travel in time. It is shown that the cause of the present, in time, is the acceleration of the rate of time in the Universe. Options for checking the conclusions are offered.