...yeah man, it takes longer than 10 minutes to run the tests and from what you describe it sounds like they just forgot to label the cup.

keep in mind that you can get cannabis piss test's at your local drug store so if you face a test in the future you can run through your chosen strategy ahead of time and then test your piss yourself, just so you know, with certainty, that your chosen strategy works, ...peace of mind is priceless.

peace, bozo