MacArthur Park song: 7.5 minutes
The first song lip sync by Michael Keaton in this movie was not funny. When they later had multiple characters lip sync the 7.5 minute "MacArthur Park" song by Richard Harris, it was a case of beating a joke to death.
Saturday Night Live has failed in this way for over the last 10 years. They try to fill a 90-minute live show by beating every joke to death, prolonging every skit. When it is not funny to begin with, it just becomes painful to watch.