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There are various apps like esteem/surfer which allow you to post on the steem blockchain through their interface. These apps have more features than steemit.
One of these interesting features is editing the posts after the payout is over.
Though these enhanced apps can allow editing after 7 days, typically they can not permit payout beyond seven days as it is the inherent limitation of the steem blockchain itself. Hence editing after seven days is a feature in various applications but extending payout beyond seven days is not possible