[AppyPappy]

A google search shows 13 days is the norm for a pee test.

[JustSayNoToNannies]

It's common to test for inert metabolic byproducts of THC, which can stay in one's system for up to 30 days - long after the high is gone.

A google search shows 13 days is the norm for a pee test.

I Googled urine test days, and the first result (#5 - http://www.drugtestingnetwork.com/urine-testing.htm) that wasn't about how to beat a test said this:

Cannabinoids (THC, Marijuana) Detection Time:
1 time only	5-8 days
2-4x per month	11-18 days
2-4x per week	23-35 days
5-6x per week	33-48 days
Daily	49-63 days