Listing the length of each attraction at Magic Kingdom, in minutes:

Magic Kingdom Attraction Durations
Attraction Duration
Astro Orbiter 1.5 minutes
Dumbo the Flying Elephant 1.5 minutes
Mad Tea Party 1.5 minutes
The Magic Carpets of Aladdin 1.5 minutes
Prince Charming Regal Carrousel 2 minutes
The Barnstormer 2 minutes
Meet Ariel at Her Grotto 3 minutes
Frontierland Shootin' Arcade 3 minutes
Peter Pan's Flight 3 minutes
Meet Tinker Bell at Town Square Theater 3 minutes
Seven Dwarfs Mine Train 3 minutes
Meet Mickey Mouse at Town Square Theater 3 minutes
Meet Magnifique Disney Friends as Circus Stars at Pete’s Silly Sideshow 3 minutes
The Many Adventures of Winnie the Pooh 4 minutes
Tomorrowland Speedway 4.25 minutes
Buzz Lightyear's Space Ranger Spin 4.5 minutes
Let the Magic Begin 5 minutes
Main Street Trolley Show 5 minutes
Big Thunder Mountain Railroad 7 minutes
Under the Sea ~ Journey of the Little Mermaid 7 minutes
Meet Daring Disney Pals as Circus Stars at Pete's Silly Sideshow 7 minutes
Pirates of the Caribbean 7.5 minutes
Jungle Cruise 8 minutes
Hoedown Happening 8 minutes
Country Bear Jamboree 10 minutes
Space Mountain 10 minutes
The Haunted Mansion 10 minutes
Tomorrowland Transit Authority PeopleMover 10 minutes
Meet Cinderella & Elena at Princess Fairytale Hall 10 minutes
Meet Rapunzel and Tiana at Princess Fairytale Hall 10 minutes
Mickey's PhilharMagic 12 minutes
Stitch's Great Escape! 12 minutes
Swiss Family Treehouse 12.5 minutes
it's a small world 14 minutes
Once Upon a Time 14 minutes
Royal Majesty Makers 15 minutes
Move It! Shake It! Dance & Play It! Street Party 15 minutes
Monsters, Inc. Laugh Floor 15 minutes
Disney's Celebrate America! - A Fourth of July Concert in the Sky 15 minutes
Casey Jr. Splash 'N' Soak Station 15 minutes
The Muppets Present...Great Moments in American History 15 minutes
Walt Disney's Enchanted Tiki Room 15.5 minutes
Liberty Square Riverboat 16 minutes
Happily Ever After 18 minutes
Splash Mountain 18 minutes
Captain Jack Sparrow's Pirate Tutorial 20 minutes
Flag Retreat 20 minutes
Dapper Dans 20 minutes
iCan the Showbot 20 minutes
Casey's Corner Pianist 20 minutes
Main Street Philharmonic 20 minutes
Walt Disney World Railroad Frontierland Station 20 minutes
Walt Disney World Railroad Fantasyland Station 20 minutes
Walt Disney World Railroad Main Street U.S.A. Station 20 minutes
Sorcerers of the Magic Kingdom 20 minutes
Mickey's Royal Friendship Faire 20 minutes
Enchanted Tales with Belle 20 minutes
Walt Disney's Carousel of Progress 21 minutes
The Hall of Presidents 23 minutes
Tom Sawyer Island 30 minutes
Disney Festival of Fantasy Parade 30 minutes

Duration of Attractions at Other Parks