it wont take much on stock internals.
Maybe 5psi from a non-hybrid T3 for more then... dunno, 6 months would blow a turbo.
That's just a guestimation, as every motor is slightly different.
I would recoment putting the boosted h22 on a dyno+o2 sensor and seeing just how lean the motor runs with 5psi. If it's not too much over 13:1 it should survive. Hell I ran @5psi on my D16Y8 for 6 months @ 14:1 a/f and she's still running strong.