4th job Single Target DPS

Might consider stripping a mechanic, and do a 1vs1 test on bearwolf or castle golem and see how long it takes. Works even better if you can get combat order to lower deviation, then tank+siege estimate will just be

x * (expected damage from tank) + y (expected damage from siege) + error term = mob hp
x + y = time for kill

x and y are duration in said forms in seconds or whatever units you want. You want to calculate y, so x should be the timed factor or variable of interest.