I just quested my 5 shaman team to 60 in 2 days 1 hour. The Totem quests really slowed things down in the beginning, 50-60 went pretty decent with WPL/EPL/Felwood/Winterspring, just cherry picking kill only stuff, no collections.

Boosting a 2nd team of only 4 will likely be faster, but might drive me batty.