Mine stays up ~35 minutes. I have 590 IF and Powermonger mastery. I'm not sure what if anything determines duration and will leave it to others to weigh in on that.

Rhadyn da Dwarb - Blood for fire!

so if max duration is 40 minutes what is it that determines the duration? is it just ranks in IF?

ah, so the higher my warding ranks the longer my tenacity is up.
thanks this is just what i was looking for.

I always assumed it worked exactly like regular magic, where PM (whatever name) simply acts as an up to X% modifier to your magic skill, and the magic skill determines everything.

Interesting.
IF 591
Ward 510
Powermonger and Yogi
Tenacity (Basic meditation)
Serenity (Advanced meditation)


No Bear Form up
The Serenity meditation will persist in your mind for 30 roisaen.
The Tenacity meditation will persist in your mind for 32 roisaen.

With Bear Form after one minute wait (bonus to warding)
The Serenity meditation will persist in your mind for 32 roisaen.
The Tenacity meditation will persist in your mind for 34 roisaen.

Looks like in fact Warding skill plays in to the duration of abilities that use Warding as well as the difficulty of the ability. We can surmise all other abilities use their corresponding skills for duration as well.

So are the difficulties what cap at 600 (basic) , 900 (Advanced), 1200 (Expert) ranks in associated skill that Kodius mentioned a while ago?

Rhadyn da Dwarb - Blood for fire!