Buff Bots: $npc->CastSpell vs. quest:selfcast ??

[Ciji]

This likely has nothing to do with the problem so i apologize in advance for potentially side tracking your thread, but when the quest:selfcast is used does it ignore the spells duration all together and use one pre set somewhere else?

Example being, you create a spell that adds X amount of HP for... say 2 hours, it would ignore the two hour duration art dor the spell and create its own? If that is the case, where ous the data being pulled from to create its own timer?