I've been blasting a site of mine for the last month and a half. I run xrumer 24/7 on 3 computers for different keywords, but the same domain on aggressive posting mode, 1200threads combined. I have no idea how many I have blasted, but i literally haven't stopped xrumer for even an hour for about 40-50 days. When it finishes I start it all over with different accounts. Just to clarify this is 1 month old site. I bought the domain and started blasting it. 1 week ago my site started dancing and placed me intop 10 for a very competitive keyword with 55 million results. Yesterday I was second for "bonus" for a couple of hours and 6th for "world cup" . It then removed me, but those are very strong signs of something huge happening to my site in google. So far I havent seen sandbox. And I believe I wont see it. I will be runing it until september or october.
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That is some awesome results and great scaling.
Good job!