Introduction: the motor commitment time according to Gomez and Sanchez (2014), is that time in which the students dedicate it to a motor activity, considered as a measure of teacher effectiveness as it is the time in which more learning occurs in a class of Physical Education. Material and methods: in this work the main objective has been to assess the time of motor commitment of the students, so I have registered a sample of 20 students of the first cycle of primary education over 4 weeks (1 month), at different times of the day. The tool used was a chronometer and a record sheet where the moments of motor activity of the students during the session were collected. Results: we obtained an average of 54.29% of motor engagement time in physical education sessions. Conclusions: it has been concluded that the motor commitment time is much higher in the session after recess, with the shortest time during the first session.