6 Hours for the first one, 12 hours for the second, 24 hours for the third etc. The time doubles for each new trait. And, this is for each item. There are passives that allow more than one item to be researched, and that cut down the time needed. The 4th passive even caps the max time for the last two to less than 30 days (how much less depends on ESO Plus)
Scroll to bottom to see time details for all scenarios
Here is a way to make trait research more efficient, as you don't need to learn traits on items you won't make or use
Back to the Crafted Sets, it takes 6 traits known to be able to make Hundings or Julianos, 9 Traits for Twice Born Star. You don't need to know these traits on everything, but you do need to know them on the items you will use. So, start learning those traits. Focus on the gear you will use first, then fill in the rest later. This means:
Casters
Heavy Chest/Legs
Light Feet/Hands/Waist
Shoulders and Heads are good to, but there are 2 Piece Monster sets that can take up those slots. So learn the traits on these pieces, but prioritize the ones above.
Staves (all 4 of them)
Stamina
All Medium Armors
Daggers, Swords, Bow and Shield
Learn Training, Divines and Infused on the Armors first, Infused, Sharpened, Precise and Training on the Weapons. Powered is good for the Healing Staff, Defending is good for Sword or other one handed Melee. Then fill in the rest until you have 6 or eventually 9 traits. Some people recommend Nirn as an early trait to learn. Unless they change it, don't listen to them. You might use it on a Shield or a Weapon but that is about it. You need it someday, but it's expensive and you need your gold for other things.
Invest the skill points into the Research Passives. I can't stress enough how much of a time sink Trait Research is. Be able to learn more than one at a time, and reduce the time needed. Get an addon for Trait Research Tracking, I recommend Craft Store. If your on the Consoles, find one of the spreadsheets out there or make one to track this. Have I mentioned you need to learn your traits?
Edited by Nestor on March 7, 2018 4:28PM
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