I just checked. There's no 3 year reference in the "2.0 Item Scroll Production Helper" Google doc with the 2.0 Ritual text; that got removed a long time ago.
@tieran - Can you point to where you're seeing a 3 year reference, please?
This is also the first line item people see when they visit the 2.0 Prerelease section of the forums. It's in the format they are probably used to looking at rituals in, as opposed to the Google Doc.
That's why i was confused as well when i saw it in the 2.0 list as the duration of until used/or 3 years.
Vengeance
Aspect: Celestial Difficulty: 6 Catalyst Required: No Target Type: Spirit
NPC Only Ritual: No Role Play Only: No Scroll Type: Enchantment
Casting Time: 5 Minutes Duration: Until Used/or 3 years May Be Extended: No