Buffs that last a bit longer

[Delmontyb]

Protect + shell should last 10 minutes and not pull more hate than provoke or taunt.
Shock spike should last 5 minutes
Stygian spike and stoneskin should last 3 minutes.

Also, THM and CON should have like a rnk 25 quest that teaches them an ability that lasts 1 minute (10 minute CD) and doubles the length of these buffs when casted under the effects of this ability.

I'm down for this, anything that gets us questing more... I'd vote to make it a trait though, love me some passive abilities.