How long does urine contained in a pill bottle stay potent for drug tests for?

I had my friend with a clean system urinate for me in a pill bottle to pass a court mandated drug test, this was 13 days ago. would i still be able to use this urine in the drug test? or will it be detected that its been sitting for an extended amount of time? could i mix a much smaller urine sample from the SAME person with their previous sample from 13 days ago?