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.
Thanks!