Based on a couple of articles I've read. The payout is done 7 days from its original creation. That being said, on the main posting it should only pay out once however if you comment and someone upvotes your comment it should get paid out within 7 days... that's my understanding but I've only been on here for a few weeks so no guarantee it's accurate.

Here's a couple:

• https://steemit.com/toolkit/@sndbox/earn-steem-by-upvoting-how-curation-rewards-work-on-steemit
• https://steemit.com/steem/@dantheman/how-to-maximize-curation-rewards