Anniebach
Do all train 12 hours a day ?
Do you mean the contestants or the professionals like Giovanni, Anniebach?
Strictly professional dancers will work around 12 hours a day, not just dancing but choreographing, selecting music, discussing sets, costumes, make up, basically refining every part of the number they perform. The celebrity performers are contracted to work 12 hours a week. Big difference, though that time obviously includes additional group dances too.
When you work with people who really know how to dance it's easy to put together routines in a short time. It's hard work with others. You have to keep adjusting..