I am a nice guy (sometimes).
I have some across a few OPs that just don't like giving up and the question/answer sometimes veers waaaay off into the distance.
For example this recent inquiry... Started off that I was answering the question then it got all technical and a little off topic, should I just stop commenting?
I have done that before for other answers. Once in a blue moon I have commented something along the lines of
I am done. after the comments get too long.
What is the suggested length of time one could and should be vetted with one OP when the commenting back and forth seem to be getting nowhere?