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After 30 minutes, all the curation rewards you'll get from your vote is for you. At 0 minute, all go to the author of the post, and it's linear between 0 and 30 minutes. So after 30 minutes, you'll be getting the full share of the curation rewards.

But there's another rule : First come, first served.
The percentage of the curation rewards you will get after 7 days depends on your position of arrival in the upvotes.

thank you for the question, and thanks to @algo.coder for answering it!