One can simply look at the right-hand-side of their browser window and see the scrollbar height to gauge "accurately enough" whether it's long or short.
More to the point, I would expect anything purporting to be an "ultimate" guide to ffmpeg to be a massive time sink that simply can't (and shouldn't) be ingested in one sitting. It's either going to be incredibly dense or it's going to leave out innumerable details, leaving many things implicit. Don't get me wrong, there is nothing wrong with those approaches, but it means that "how long" it takes to read will depend on the reader and what they actually end up reading.
One can simply look at the right-hand-side of their browser window and see the scrollbar height to gauge "accurately enough" whether it's long or short.
More to the point, I would expect anything purporting to be an "ultimate" guide to ffmpeg to be a massive time sink that simply can't (and shouldn't) be ingested in one sitting. It's either going to be incredibly dense or it's going to leave out innumerable details, leaving many things implicit. Don't get me wrong, there is nothing wrong with those approaches, but it means that "how long" it takes to read will depend on the reader and what they actually end up reading.