If your menstrual cycle is lasting longer than usual, it could be due to a myriad of reasons. Hormonal imbalances, stress, changes in weight or exercise routines, and certain medical conditions like polycystic ovary syndrome (PCOS) can cause your periods to last longer. It's also worth noting that what is 'usual' can vary greatly from person to person. If you're experiencing consistently long cycles, it's important to consult with a healthcare provider like Dr. Beyerlein.