It seems what we've actually got now is sort of an acknowledged continual-on-and-off impeachment that's not an impeachment.
Pelosi has stated there would be no vote on impeachment. This leaves the process somewhat ambiguous, and if it were pushed to the limit, she would lose this view before the SC.
That's the sort of thing that could go on almost forever, and get nowhere. The only outcome that's obvious is continual repetitious media coverage of "the impeachment."
The only vote she is required to have is the actual vote to impeach. There is no requirement to vote on whether or not they should vote to impeach.
That's not really accurate. It represents one opinion, and as you know, there are other opinions.
In a broad sense, nothing could ever get done in parliamentary bodies without guidelines on issues like this. When is the discussion starting? when does it end? Etc.
That is why...
https://en.wikipedia.org/wiki/Cloture