We knew that the approach was crazy but at the same time, it seemed a great opportunity.
As always, we proposed the timeline for an architectural animation in reverse chronological order. The video, initially, was raised with a duration of three minutes. Therefore:
3 min x 60 sec = 180 seconds,
every second needs 25 frames => 180 x 25 = 4,500 frames.
Through our experience in similar work, we set the limit calculation of 5 minutes / frame. You can always improve an image but you have to put a limit. Certain parameters can quickly multiply the calculation time of a frame and, consequently, the total.
Therefore 4,500 x 5 min = 22,500 minutes = 375 hours = 16 days.
Our small rendering farm allowed us to reduce those 16 days to 4. Of course, if all went well on the first try.
And that does not happen EVER.
Therefore we had to have at least a week for the rendering process.
There were some frames that took less than five minutes. However, those with numerous light sources or millions of polygons, went to 45 minutes.