It is normal for menstruation to be clean in 2-3 days. The normal menstrual period for women is 2-8 days, and the normal blood volume is 20-60ml. 20ml is a concept, that is, during the whole menstrual period, as long as there is a piece of sanitary napkin can be permeable, basically it can not be diagnosed as menstrual flow, so it is OK to have a clean period in 2-3 days. During this process, as long as you don’t use pads every time and need to use sanitary napkins one day, the blood on the sanitary napkin can be permeable, and the period and the volume of the period are okay. As we grow older, the menstrual period will be shortened, and the menstrual cycle will also be shortened, that is, with the increase of age, the menstruation will be earlier, for example, the original is 28 days, may be 26 days when you are 30 years old, to more than 40 years old may become 25 days, or even 21 days; and the volume of menstruation will gradually decrease, for example, when you are 20 years old may be 5-6 days clean, to 30-40 years old may be 3-4 days, or even 2-3 days. -This is a normal phenomenon. It is normal for menstruation to be clean in 2-3 days if it is not accompanied by a lack of menstruation or other symptoms, such as abdominal pain, backache or dizziness, tinnitus, blood clots or abnormal color of menstruation, etc. If there are no such conditions, it is normal for menstruation to be clean in about 2-3 days.