A tick is 6 seconds. If you are assuming 20 mana per tick, it would take 14 ticks (84 seconds) to med enough for a single rend. Then you have to consider the cast time of rend (6.3 seconds), and the fact that it can be partially and fully resisted. You also have to account for evocation specialization mana reduction. If you take all of the complicated things out of the equation, and assume the spell lands for full damage every time, that's like a 784/900 weapon (lets say 78/90). Of course, it would be less than this, because this doesn't take into account the lack of damage bonus, nor the partial and full resists.
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