Worst case scenerio, you're fat do not work out and have a slow metabolism people have tested dirty after 60+ days. I myself got clean in 3 weeks with little or no dilution. It is really up in the air everyone's body is different. But i'd say the most absurd out there scenerio you would be looking at 60 or more days to get clean. Test yourself and if you come up dirty and do not want to bother with the dilution method then get some synthetic urine.