Final answer:
Recurrent decelerations occur in fetal heart rate monitoring during labor, but the exact percentage varies.
Step-by-step explanation:
Recurrent decelerations occur in fetal heart rate monitoring during labor. These are temporary decreases in the heart rate of the fetus. The percentage of time recurrent decelerations occur may vary depending on various factors such as the condition of the fetus, the stage of labor, and the presence of any complications. It is not possible to provide an exact percentage without specific context and information.