ok, so I ran 3 shammies to 60, stopped there and figured i might as well level up 3 individual characters to transfer to my main account when they are 60 as well...

my 60 shammies, just over 3 days played on them... my 3 individual characters (individual as in not intending to box), 13 hours... and they are 28 at the moment... all instance grinding with a 70 pally.

my pally has really good gear, and is an enchanter... so DE greens, good money. As horde I went from rfc, to WC, to SM, to strat... and its all good xp. In my opinion, id skip the questing if you have the means to do instance grinding.