I swear spectral jig used to last a good while. then one day it up and was changed to be sooo short. I understand that it gives both invis and sneak but it seriously lasts just enuf to get thru a herd of aggressive monsters and thats bout it sometimes. then you have to hope there is a spot between two groups of face eaters to safely recast it. Thank god i started a whm mule so i can jsut use chocobo jig and rely on magic sneak and invis.