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Yap correct.
Unless you are working with a computer and sit in front of your computer/laptop and turn-on notification of your telegram. If specific christmast event, I still manage to claim because know the time they starting share the code + working as moderator required me to keep open telegram all the time. If they just share giveaway code with random time, usually will be hard.
So pure luck only, we are online at the time they're sharing the code.