Sure, process twice, render once :-)
The first 'processing' which clearly was not rendering, took seven hours. Now I am starting the second processing, called rendering, which is processing at one frame every 15 minutes. It does look like the flickering has stopped, which is a huge improvement, so seriously, thank you for the help on that. The only problem now is that to render out my 3-minute scene, which is 5000 frames, it is going to take over 52 days to finish at the current rate, and this is on about the highest end matching that existed a year and a half ago.. and I have it only at 720 I really want this scene to be in 4K, but that would take a year of rendering..