What is the expiation required from a man who had intercourse with his wife during the daytime in Ramadan for several days while he is not muhsan (meaning he has not been married before), and is the expiation repeated with the repetition of the days, given that he does not remember their number?

If an unmarried man commits fornication several times during the daytime in Ramadan, he has committed a heinous sin. He must hasten to sincere repentance, increase in seeking forgiveness, and perform righteous deeds. The expiation (kaffara) is repeated for him according to the number of days he corrupted by intercourse.