I don't think there's a time length on it either. 
Even if something has been out a relatively long 
time, there might still be people who haven't 
seen it but will. Escaflowne is actually a 
perfect example for me -- I didn't see it until 
only recently, despite how long it's been 
available in the US. I would have been severely 
POed to have someone wreck the "Dilandau twist" 
(as Lizzard so quaintly put it ^_^) before I'd 
seen it on the screen.

How many capitals and exclaimation points did I 
put in that e-mail, Lizzard? ^_^;;

Many Sharp Smiles,
--Drac