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It took me 45 - 75 minutes to get the last 2-3 levels in blasted lands. The zone used to be a nightmare of low-drop crappy collection quests but those are gone in Cataclysm. The last 2-3 levels go very quickly there, as shown above. I dont know if the zone still sucks for horde or not...
I tried hellfire ramparts on a team prior to these using the LFD tool. At 58 i got over 2k xp per kill. You need a real tank-3 dps-healer group though because patrols and runners can get a big mob on you sometimes. Halfway through the instance i went back to questing but someone with experience 5 boxing instances could do well here. I did try the same team here at 60 and it was much easier.
Just level 5x of every composition you think you might enjoy down the road.
Don't worry about the spec now.
Just get a lot of options to choose from.
my /playd was 1 day on my first grp long time, did a 2 grp now in cata used 3 days whit about 3-5 houers playing time :)