It is possible to get an infinite amount in one fight as long as 1: you keep using the spell type corresponding to the eye and 2: the battle continues indefinitely. The only exception to this is death eyes as it is based on the number YOU kill. 3-5 for every one you do. The most of any element ess I have heard rumor of is someone getting is about 100 chaos from the last duels. My personal best is when I went against the final boss to get skellys... 57 order

If you are talking sparks then 50 inceptions for each mob or 100 of the others.