Can sperm survive as long as seven days?

It is believed that under favorable conditions, normal sperm survive and may have the ability to fertilize the egg for about 48-72 hours, but some male cells can survive up to 5 days. The possibility of surviving as many as seven days seems doubtful, but you can also meet with such information. Therefore, the first fertile day of a woman is not the day of ovulation. The possibility of fertilization exists throughout the periovulatory period, i.e. a few days before and shortly after the onset of ovulation. At the same time, unambiguous and reliable determination of the moment of ovulation is difficult. Ovulation tests are helpful, and patients trying to get pregnant are also monitored gynecologically on ultrasound to capture this moment. If the sister set the day of ovulation solely on the basis of a "calendar", then there is a margin of error, which means that it cannot be excluded that the said intercourse could have led to pregnancy. I enclose additional information: https://www.gdziepolek.pl/kategorie/test-ciazowy