Blown Head Gaskets how long...

[compaqpunch]

My 92 stealth TT just blew its heads, how long can the engine set before I have to worry about rust or some-kind of eternal damage

[91STT]

nearly impossible to tell because you don't know how bad and where it is leaking.
typically, if you are not starting the engine it should not seep to badly into the engine.
if it is seeping into the exhaust side, it may not be as bad as say the intake side.
i say may because if you get fluid into the cylinder, rust is the least of your worries, hydro-lock would be much worst.

[Stealthee]

Considering it is EXTREMELY rare for blown head gaskets on a 3s I'd like to know why you think they are bad.