YouTube shows how many videos a playlist has, never how long it takes. Paste a playlist, channel or video link to get the total of every video (up to 5,000, not just the first 100) and the time at 1.25× to 2× speed. Then pick minutes a day to get a finish date and calendar events. Compare courses side by side, or add the free Chrome, Firefox or Edge extension to see the total on YouTube itself. Free, no signup. Not affiliated with YouTube.