googleboy: it depends on your skilset ... if i use Sorc-Witch-Vitalism i keep running out of mana, but except for weird situations (roaming mob bands) it never dies... also i am around 3 levels over the mobs, and use a fighting bear with the 3 skills on auto (the one that takes aggro from you to the pet is invaluable to recover health, after 2/3 hits the mob aggros back to you)
It might be better with plate armor rather than cloth, as tanking (with vita to cure) is better than DPS for farming.
Also it consumes hardtack and the cheapest mana soup (grain?)
BTW: Enervate & Firebolt is NOT convenient to recover mana.
i switch to daggerspell (Sorc-Witch-Shadow) after farming.