The reason why it is taking so long, is that investigating Trump, so many crimes are beign discovered, done by the people all around Trump, that it has slowed down the direct investigations fo Trump himself. That is why it is taking so long.
Bingo. This is not just about Trump. Mueller has had enough to send him to federal prison for over a year. This is MUCH bigger.
Better run a cleaner and reboot just to safe.
Fresh install on a brand new drive.