So I got an extra quest buff for the Wizard, and I thought okay, I will do them. I think I got 7 done when the notification showed up - the buff had run out. Well, that seemed pointless. An eleventh quest is not going to do anyone any good if you can not even get to 8 before it runs out. Therefore, my suggestion is to please make the buff last longer. A minimum of 20 minutes seems reasonable.