Processing a video after you are done recording should take no more than a few seconds. Only if the recording is 15 minutes or more will you see a longer video processing time. Even then, it should display within 10 seconds.
If this is not the case and your video has been processing for more than a couple of minutes, we are very sorry but the video is lost in the internets.
It currently happens to less than 0.1% of all videos and is something we are continuing to drive up to 100%.