Instance boosting? Questing? Using the LFD tool? Queuing for BGs? 2 Accounts? 5 Accounts?

I can give my answer though...

Instance boosting 4 accounts to 60 with an 80 Warrior I had /played times around 16 hours per team. If I buckled down and stopped dicking around between runs I'm sure I could've gotten it down to about 12 hours per team; but I like to take breathers every once in a while.