Originally Posted by flyingtoastr

Going with an Attack Rate Constant of 1.548 giving you an effective cooldown for JoW of 4.64 seconds (just trust me on this, that's a 3.5 speed autoswing timer with a CS = DS > J cycle) and a fully buffed mana pool of 7100 JoW is worth a measly 160 Mp5 for ret pallys.

A CS = DS > J cycle with resealing on the dot costs 827 Mp5. Even with every improved regen buff possible:
JoW: 160 Mp5
BoW: 109 Mp5
Mana Spring: 62.5 Mp5
Replenishment: 177.5 Mp5

Total regen, 509 Mp5. To do a base cycle a ret pally goes 318 Mp5 in the hole. With that 7100 mana pool that ret pally hits OOM in just over 111 seconds, less than two minutes.

Assuming you pop both Divine Plea and a runic mana pot you can extend that by another 47 seconds, giving you about two and a half minutes of DPS time under perfect circumstances.

Raise. Some. Hell.