upvoting at around 4-5 minutes to maximize the curation rewards.

It isn't actually the best maximization technique, because usually big names attract lots of auto votes on that 4-5, thus actually undermining each other's curation rewards. The best strategy is to find quality content from yet to be established authors, because there is a real chance now that a quality post will get a large vote now that lots of stake is doing curation.
This of course is excellent news for new users.

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