Theres millions of fat cells in a persons body. There would be no way for THC metabolites to be stored "beyond capacity".

Theres no telling how much THC is metabolized every day because each person is different, plus there are so many variables to take into account. To conduct any scientific experimentation, you can only change one variable.

Periodic home testing is the most realistic and reliable way to gauge how long it takes for a person to test "clean".