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Never. This is to ensure the safety of the network. You can, however, check webmaster tools for the links, as I don't block Google.
Be 100 percent certain of your order when you make it. I will not change posts after they have been posted/indexed and scheduled.
The posts are permanent and will be on the homepage for about 3 - 4 weeks and then roll off into the inner pages.
TAT is hard to state. In most cases I am dripping posts 30 days or more. This also means I'll have to deliver early to avoid the auto-refund since the max guaranteed delivery date is 29 days. I also have to get content ready and queued. All of that takes time. When I deliver I give you the last post date for your order so you know when things finish.
Yes, they go on different/unique blogs. Remember I'm human if this does happen, let me know and I'll replace.