The term “vacation” generally refers to menstruation. How long does it take for a girl to have normal menstruation after menarche is related to her own condition, and the regular cycle usually occurs in about 3-6 months, and the time may vary due to her own physical condition. The establishment of regular menstrual cycles after the first menstruation of a girl is usually influenced by her own hormones and the ovarian ovulation function, and it takes a period of time for the body to adapt to the cycle, which usually occurs in about 3-6 months. Adverse reactions such as menstrual disorders may occur during the adaptation phase, which is generally normal. It is recommended that girls pay attention to personal hygiene during this period and develop a good routine, which will help to regularize menstruation in a short period of time.