Last year's impeachment proceedings were a relatively drawn out process, playing out over a month and a half, and it resulted in an impeachment without removal from office. That is similar to the length of time taken for Clinton's impeachment/non-removal. Andrew Johnson and Richard Nixon's impeachments took several months. But what's the fastest it's possible to go through the process?
Ideally, I'd like the answer for two scenarios: What if a large majority of each chamber (including party leaders) wants to impeach and remove, but there are a few Representatives and Senators who object, and what if it's unanimous? Is it even possible to impeach by unanimous consent, or is a full vote required?