"Koh " is only time limited because zoro drew out all his haki to keep his blade in check at that point in time
but the core part of the ability which is what I really should have said , that is coating his attacks in conquerors , is not. its not like gear 4 because no matter what luffy does , it will always have a hard time limit.
using enma will not always have a time limit . he will learn how to use the blade just like oden did.
its a simple matter of experience.
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sidenote though been thinking zoro's next fight ideally should be a top tier but taking into consideration luffy's fights are in many ways not ones that cement him significantly above his opponents
while zoro and sanji's are , then the progression to shiryu/lafitte makes sense.