Looking at TP Usage *** UPDATED FOR 3.2 CHANGES
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Matching to Highest TP usage class for Paeon Timing (DRG)
DRG - 2.4s GCD @ 68 TP/GCD = 1700/min (1450 TP Regen/min) -250/min ~4 Minutes to go TP Dry

MNK - 2.125 GCD @ 57 TP/GCD = 1609/min (1400 TP Regen/min)
NIN - 2.125 GCD @ 57 TP/GCD = 1609/min (1400 TP Regen/min
BRD - 2.25 GCD @ 52.5 TP/GCD = 1400/min (1400 TP Regen/min)
MCH - 2.5 GCD @ 61.67 TP/GCD = 1480/min (1520 TP Regen/min)

Equalized to Dragoon TP usage
MNK - 2.07GCD @ 57 TP/GCD = 1650/min
NIN 2.07GCD @ 57 TP/GCD = 1650/min
BRD 1.9GCD @ 52 TP/GCD = 1650/min
MCH 2.1 GCD @ 61 TP/GCD = 1770/min (Quick Reload + Invigorate)


These are the GCD values you can achieve in order to equalize to DRG TP usage as the lowest denominator before needing to Paeon. Does not include heavy AOE situations, but all classes should scale similarly in TP usage for a given AOE situation.