For the Wii
Wii System (if you have the update) It's prompts you to press A after you press A it takes about 5-6 seconds to load the menu.
Disc Channel it takes about 10 seconds to load a Wii or GC disc.
Wii Shop Channel could take up to 30-45 seconds depending on your internet connection.
Zelda TP takes 2-3 seconds to load after you select your file.
Resdient Evil 4 Wii take 2 seconds after you select your file.
Warioware pretty much seemless due to gamplay style you will never know it's loading.
Rayman takes 1-2 seconds when going into a each mini-game.
Super Paper Mario 1-3 second load times but they have really long cut secnes so it most likely load during that.
Will update more later.....