We know Disney often reused animation from previous films. I'm curious to learn if the practice for worse over time, or that did perhaps faded away.
Do we know which film reused the most animation?
I can think of several ways to measure this by, the main two being the absolute length of reused animation, and reused animation as a percentage of the overall running time of the film it was reused in. Those two are what I'm interested in, but I'm open to other interesting metrics.