You can find all the Lord of the Rings movies so far in chronological order (you can see the length of the movie in minutes in the parentheses) https://www.imdb.com/list/ls072068350
- The Lord of the Rings: The Fellowship of the Ring – original release, 2001 (178 minutes)
- The Lord of the Rings: The Two Towers – original release, 2002/ (179 minutes)
- The Lord of the Rings: The Return of the King – original release, 2003 (201 minutes)
This is 558 minutes which is 9 hours and 18 minutes. So if you want to watch all the Lord of the Rings movies (original version), then you need almost 10 hours not counting any breaks between the films. Click here if you want to know how long does it take to watch all the Lord of the Rings movies (extended version).