YouTube Playlist Duration Calculator is a Chrome add-on developed by DavidLee. This free tool allows users to easily find out the total duration or length of YouTube playlists, whether they contain lectures, tutorials, music videos, or movie clips. With this add-on, you can keep track of the playlists you are watching and see how much you have watched, displayed as a progress bar.

One of the highlights of YouTube Playlist Duration Calculator is its ability to handle even huge playlists seamlessly. If you have a playlist with more than 100 videos, simply scroll down and load more videos to find out the full length of the playlist. The add-on also provides clear instructions on when to hit the refresh button to ensure accurate calculations.

Once the time has loaded, there is no need to refresh again. You can easily access the total time and progress by clicking on the add-on's icon. This makes it convenient to keep track of your progress without interrupting your viewing experience.

Overall, YouTube Playlist Duration Calculator is a handy tool for anyone who wants to know the total length of YouTube playlists and keep track of their progress. It is easy to use and works effectively, making it a valuable add-on for YouTube users.