Your raid progress is wiped on Tuesdays, so starting on a Friday or Saturday will not leave you a full week to have your progressed saved or lost before you complete the raid.( though if your confident you can't beat it in a couple days starting on a Friday or Saturday isn't that bad)
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Got it. Thanks kirito! Thats a good point. It would be best to give your team enough time to beat it.
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No problem. Good luck on the battlefield.