Disneyland gets a new day parade on average every five years. In WDW they also get an all new Magic Kingdom day parade every five years, except WDW executives count in Dog Years.
But... According to this thread and our new friend
@ckozel0318 that timeframe may be broken and Mickey's Soundsational will only last four years.
Mickey's Soundsational Parade, 2011 to 2015??? (Four years?)
Walt Disney's Parade of Dreams - Presented by Sylvania, 2005 to 2011 (Six years)
Parade of Stars, 2000 to 2004 (four years)
That one was a parade only Cynthia Harriss could have loved, especially with the opening day "music" from February, 2000 that was yanked and replaced within a few weeks.