Speculations How much energy/haki does a basic CoC knockout drain?

[Vongola Primo]

Why didn't Luffy knockout all fodder inside skull dome before heading for rooftop?

How much haki does knocking out 1 fodder drain?

 

[Finalbeta]

It definitely drains something

I guess mastery counts too

Someone like Shanks can probably use it for quite a prolonged time

 

[Herrera95]

So far Oda didn't limited the usage of CoC. So I would say it is limitless.