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RE: Steemvoter.com - I just set it up.
That 20 minutes I think is there to vote at that same exact time after they post. Here's a good article that some discussion on when to vote.
The official FAQ also has a good discussion: https://steemit.com/steemit/@shenanigator/thanks-to-your-help-the-official-steemit-faq-is-now-complete