The detection time of methamphetamine (commonly known as ice or methylamphetamine) in urine varies depending on a variety of factors, including frequency of use, dosage, individual metabolic rate, body fat content, kidney function, and the detection method used. The following is a general detection window reference: - **One-time use**: It can usually be detected in urine within **2 to 4 days** after use. - **Multiple use in a short period of time**: The detection window may be extended to **about a week**. - **Long-term or frequent use**: In some cases, methamphetamine may stay in the urine for up to **two weeks** or longer. It should be noted that these time frames are only general references and the specific circumstances may vary depending on individual differences. If you have relevant legal or medical needs, it is recommended to consult a professional medical institution or relevant legal professionals for more accurate and personalized information.