Menstruation menarche has changed little in the United States since the 1950s. Menstruation is the most visible phase of the menstrual cycle and its beginning is used as the marker between cycles. The first day of menstrual bleeding is the date used for the last menstrual period (LMP). The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women, and 21 to 31 days in adults (an average of 28 days). Perimenopause is when fertility in a female declines, and menstruation occurs less regularly in
Menstrual leave a campaign for menstrual leave for female employees at Toyota. The union asked for 12 paid days of menstrual leave for a woman per year. Menstrual leave policies exist in some Asian countries, although individual companies in countries that do not have national laws may choose to implement such policies. In Indonesia, under the Labor Act of 1948, women have a right to two days of menstrual leave per month. In Japan, Article 68 of the Labour Standards Law states "When a woman for whom work during menstrual periods would be specially difficult has requested leave, the employer shall not