I did my second group, 4x Druid (Bear, Tree, 2x Moonkins) recently. Dinged 60 at about 3 days 7hours. Though, the last 10-15 levels were done 100% in instances using the random dungeon finder. I could have finished a lot sooner had I done it questing, but the grind got old. Instancing was fun.

My first group I did around this time last year. A pair of Pallies, Ret / holy. They tore through content so easily. I was impressed. I think they were at just under 3 days at 60. Though I stuck to the RaF Tour Guide stuff almost 100%