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The Delegation will be good for as long as you like. You can undelegate the SP anytime but it will take 5 days for the SP to come back to you.

As long as I have your delegated SP you will always receive an Upvote from me.

What kind of vote will 1000 SP provide?

Sorry man I was half awake at that Time so I fell back to sleep after One reply. For 1000 SP you will get an Upvote which would be worth around 40 - 45 cents per day I am giving you a limit because sometimes the vote may vary 1 cent up or down due to my own VP.

The last Upvote I gave was a little short so I am Upvoting this comment of yours to make up for the rest.