You have to remember that these actions by the DOJ and SEC are related to shareholder lawsuits (and shortseller articles) from 2011. One has to ask why it took so long to even start investigating? This could drag on for a long time -- years even. However, once resolved (either way) and the stock price will reflect the company performance again. The risks are that the company performance deteriorates further, or newer allegations are pursued dragging this on longer.
on things like intercompany transfers and regional taxes, i think the 80/20 answer would be fairly quick, but a final answer may take a while. if thats what is being investigated though, I feel pretty good.
fraud on the other hand, not sure. then again, not sure how a fraudulent company generates this much cash anyways. money laundering?