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It is a limitation of the STEEM blockchain, no vote past 6 days 12 hours can increase post rewards on a post. We lock at 6 days 11 hours, most bots lock at 5 days or 6 days 0 hours.

It's all very well to say that, but it should be in your T&C of use. Think about your PR too...

The steemit blockchain only allows upvoting for 7 days after a post is made. No matter what, at all.

6 days 12 hours, the last 12 hours are a lock-out for downvotes only.