Slightly from my exp with it, but then again, healing skillups are so slow that any boost to it is good. Personally i just spammed it on Undead Swarm. In the 1 hr besieged i got 25 full skill points which ended up capping me before the run was over.
Just think back to Divine and Enf skill, and how fast they skilled up on mobs. Cures skill at roughly that rate on undead. Its by far, the best way to skill healing up.. Now Enhancing... thats another story XD
Chocobo Status: Retired Green, Black, Red, Yellow
Whm/Blm/Rdm/Mnk/Thf/Pld/Blu/Smn/Dnc/Pup/Bst/Drg 99, War 91, Brd/Sch/Sam/Nin/Cor/Drk/Rng/Geo/Run 60
Alch 72+1, Cook 66, CC 61+1, Wood 61, Synergy 56, Bone 54, Leather 51, Gold 49, Smithing 45, Fish 15 http://ffxi.allakhazam.com/profile.xml?143946