When using ovulation test strips to test for ovulation, for people with relatively regular menstrual cycles, between 25-35 days, you can consider using ovulation test strips from the 10th day of your menstrual cycle. Usually, the test is taken twice a day, in the morning and afternoon, at relatively regular intervals. Generally, when a strong positive test appears, ovulation will occur in about 24-36 hours. After a strong positive test appears, you can test once every 6 hours instead, 4 times/day.