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It does pay to vote early. I think at around 30 minutes and I am now testing whether I should wait 30 minutes to vote on my own posts. Even though your vote is worth less you can earn more than people who's vote is worth more. I intend to do more curation testing. I waited to vote 30 minutes on my latest blog post.

Do you receive a visible curation reward when upvoting your own post? Or is that included in your author reward?

I'm still investigating that.