It is basically normal for the temperature to remain elevated for only 11 days after ovulation. If the high temperature phase is less than 11 days, it is considered that the luteal function is insufficient. Under normal circumstances, the body temperature will rise 0.3~0.5℃ after ovulation, which means that the basal body temperature is bi-directional, and the temperature should be maintained for more than or equal to 11 days, if the temperature is maintained for less than 11 days, luteal insufficiency should be considered. However, the accuracy of monitoring the duration of temperature rise to know the luteal function is not high. If you need to know more about the luteal function, you can take a blood test for progesterone concentration 7-8 days after ovulation, that is, in the middle of the luteal phase. If the value of progesterone is higher than 10 ng/ml, it is considered that the luteal function is basically normal. If you have any other questions, it is recommended to consult a professional doctor for guidance.