Weed (THC) can show up in urine for anywhere from about 3 days to over 30 days, depending mainly on how often you use it and your body’s metabolism.

Quick Scoop: Urine Detection Times

Typical detection windows after your last use (not from first use, but from when you stopped):

  • Single / one‑time use: up to about 3 days in urine.
  • Light–moderate use (a few times per week): roughly 4–7 days.
  • Daily (chronic) use: about 10–15 days, sometimes longer.
  • Heavy use (multiple times per day): can be detectable for 30 days or more.

Some rehab/clinical sources report rare extreme cases (long‑term heavy users) where metabolites were still detectable in urine close to 60–70 days, but that’s not the norm.

Why It Varies So Much

How long weed stays in your system (urine) isn’t one fixed number because THC is fat‑soluble and stored in body fat, then released slowly over time. Key factors that change the detection window:

  • How often and how much you use (pattern over weeks/months).
  • Body fat percentage and weight.
  • Metabolism and overall health.
  • Strength of the product (THC concentration).
  • Type and sensitivity of the urine test being used.

That’s why two people who smoke the “same amount” can test positive for very different lengths of time.

Other Test Types (Quick Context)

Just for comparison, rough detection windows by method:

  • Blood: around 12–24 hours, up to 2–3 days in some cases.
  • Saliva: about 1–3 days.
  • Urine: roughly 3–30+ days, depending on use pattern.
  • Hair: up to about 90 days (very different type of test).

These numbers are estimates, not guarantees, and different labs/tests can use different cutoffs.

Simple Example Story

Imagine someone who hits a joint once at a party and then stops. For them, a standard urine test might only pick it up for around 3 days.

Now imagine someone who has been vaping or smoking daily for months. Even if they stop completely, they might still test positive 2–3 weeks later, and if they were a very heavy user, even around a month or more.

Important notes (not medical or legal advice):

  • There is no guaranteed “detox trick” that can instantly clear THC from urine; time and your body’s metabolism are the main factors.
  • If drug testing is a serious issue (job, legal, medical), it’s best to talk to a healthcare professional or legal advisor in your area for personalized guidance.

Information gathered from public forums or data available on the internet and portrayed here.