When will the Mueller investigation end?

I say never. The point of it is to compromise Trump. If he veers too far from the status quo, they hamstring him with it. It simply can't end.

The FBI even "lost" all their tweets. The FBI routinely obtains information illegally, warrantless wiretapping, unconstitutional NSA tracking, etc... So a big part of their job is to "launder" information the same way a criminal launders money. They get the information, then they have to work backworks to make it appear it came from a legitimate source. So the tweets weren't lost. They were destroyed. We know from Wikileaks that the FBI has been conspiring against Trump since before the election.