Warren Buffett plowed $2.1 billion into Bank of America in 12 days. Experts warn it could be years before he sees a return.

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· *Warren Buffett bought $2.1 billion worth of Bank of America stock over 12 straight trading days.*
· *It could be years before the billionaire investor and Berkshire Hathaway chief sees a material return, experts said on Wednesday.*
· *"He could buy it for another 12 days, he can't really fix the headwinds that are...