When u pick up the quest "Troll Patrol" from The Argent Stand in Zul'drak, u get a buff that lasts 20min. If you finish the daily quest before the buff wears off you get extra reward.
When you've picked up the Troll patrol Q, abandon the Troll Patrol Q and relog.
Pick up Troll patrol again when u log back in and voila you have 2x buffs.
At like 20min and maybe 18 min.
Do the daily tasks and collect your double reward
by Zacred