Check this information below which I copied from the Achievement material (https://steemit.com/hive-172186/@cryptokannon/achievement-6-understanding-curation-and-community)

If a post is upvoted the moment of posting, 100% of the curation reward will remain in the rewards pool.
At 1 minute, the curator receives 20%, and 80% remains in the rewards pool.
At 2 minutes, the curator receives 40%, and 60% remains in the rewards pool.
At 3 minutes, the curator receives 60%, and 40% remains in the rewards pool.
At 4 minutes, the curator receives 80%, and 20% remains in the rewards pool.
If a post is upvoted 5 minutes (or later) after posting, 100% of the curation reward goes to the curator.

Remember to write in your own words