If i took 20 mg of oxycodone on saturday and the same on sunday would i be clean by the following friday afternoon if i have drank plenty of water?

Probably clear: Typically this drug is not detectable by the urine drug screen after 4 to 5 days. It depends on the condition of your liver and if other drugs are present and competing for metabolism. It also depends on the sensitivity and specificity of the test itself. Barring any continued use and any problems, your screen should be negative.