I would say, with normal metabolism and kidney function, a week would be appropriate. I assume we are talking a single dose.
Are you being tested specifically for this? Otherwise, you're chances of dealing with this are slim to none.
Halflives matter: longer acter phens will take longer to clear your system. 2C-P is certainly not a short one but not as long as DOX or 2C-G or anything.
It really depends on the method of testing.
I thought we did not allow threads on drug testing, or was that only about trying to beat tests?