A: There is a misconception about the usage time of menstrual cups. It’s better to use your cup for up to 8 hours to prevent bacterial growth that could lead to T.S.S. (Toxic Shock Syndrome). Scientific research has shown that after 8 hours Staphylococcus Aureus bacterium growth and TSST-1 production occurs. To make you feel clean and fresh for 16 hours, Beppy delivers two cups instead of one.