Yeeh, that is an entirely mudlib dependant question!
Without knowing what sort of driver/mudlib etc you are using then we can't do any more than guess.
Find the section of code which causes the mortals to wait and make it conditional on whether you are an Imm or not.
Personally I don't like the idea of locking people up like that though - the way we do it is that spells can take any amount of time to cast and don't block commands, but certain commands (like casting another spell or moving) will abort the spell.
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