I've been looking at the loading time for stages in each home console release, and have found some estimated ranges for loading times. These times I've measured from the player pressing A to the loading screen cutting to black.

Xbox: 21 seconds (character intro cannot be skipped)

Additionally, PS2 can take an additional 1~2 seconds for the elevator screen to load over Xbox and GCN.

It's worth discussing what action should be taken to accommodate for runs on other consoles, since the only accepted runs as of far have been for GCN.

6 month necro but i think cutting loading screens for version parity is a good idea :) especially because playing the game on dolphin is the most accessible means