As running said there is no "standard" for removing thc or dillution. It is different for everybody depending on mtabolism,weight,thc intake,activity levels liver and kidney functioning. Thats why there is no one size fits all. Its the same with any kind of prescription meds. What works for one person may not work for someone else. Thats why I like to see responsible smokers educate themselves and test themselves to see what it takes for them to get clean. For dillution is an option for others subbing is the only option.