How long can urethral stones be discharged depends on the gender of the patient and the size of the stones: First, in the case of female urethral stones, if the maximum diameter of the stone is less than 1 cm, the majority of patients can be discharged within 24 hours. Because the female urethra itself is relatively short and spacious, stones are rarely seen to stay in the urethra and most of them can be discharged smoothly. Secondly, if the stone is less than 6 mm in the male urethra, it can be expelled within 24 hours by urination. However, if the stone in the male urethra is larger than 1cm, it may not be discharged and needs to be removed by urethroscopic lithotripsy to achieve the purpose of stone removal. Thirdly, if the stone is located between 0.6-1cm, it may be expelled within 3-7 days after drinking more water and urinating more. However, it may stay in the urethra and cause persistent pain or difficulty in urination, so it is necessary to go to the hospital for further urethroscopic lithotripsy.