I put together a two-part demo video of me making a teapot from start to finish. I was able to share the video with my Westchase Artists Society friends and so that the video could be watched in one evening I edited it down to 30 minutes. Thanks to fast-forward the video is 30 minutes. If I were on fast-forward the process would take about 30 minutes, but I'm definitely not on fast-forward so the process takes longer. One day I'll clock myselt to get the definitive answer to the question.