That case also established 18 months as an upper limit. If you are in that situation it is usually better to simply jot divulge. Especially if there is incriminating evidence. Or you are a journalist being harassed by the DOJ. It can only bring you more pain. They will always find something.

Yeah well that's what I'm saying... "just plead the fifth" is nice on paper, in practice you're going to suffer for a long time.