Weed (marijuana) can stay detectable in urine for a variable length of time depending on usage frequency and individual factors. Here are the general detection windows for THC metabolites in urine:

• One-time or occasional use: THC may be detectable for up to 3 days after last use.
• Moderate use (several times per week): Detection can last about 5 to 7 days.
• Daily use: THC metabolites can be found for 10 to 15 days.
• Heavy or chronic use: Detection can extend to 30 days or even longer, sometimes up to 70 days in extreme cases.

These ranges depend on factors such as metabolism, body fat, hydration, the potency of the marijuana, and the method of consumption

. In summary, urine tests can detect weed from a few days up to a month or more, with heavier and more frequent use leading to longer detection times.