I can't recall if the CB missions for Arbiter say, but if you click on the one for Ramantu it does say to do it in a single day. 

to be fair it doesnt and does say it >.<

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Is the 100m CB damage mission in one clan day?

I suppose I can see how this might trip someone up given that the one day doesn't specify whether it means the daily reset or the clan boss reset. I would assume the latter, but I can understand the opposite. :)

Yes, one clan boss day. Once the clan boss resets (now 3 AM PST/6 AM EST) then it starts the quest over again, essentially. 

Meant it doesnt say if you dont click for the info on it ;) 

And im guessing its the clan boss reset more than daily reset , since its a clan mission , would be nice to get a confirmation on that though cuz i do 2 keys before , 2 keys after daily reset,,,

I'm just glad Poly got past the equip AtK% artifact missions... 😆 🤣 

I made the ATK% my beotch......lol