I hope I posted this question correctly.

I have been invited to help open a new bakery. Does anyone know how to make display cakes. I was thinking of building the cakes out of styrofoam, and cover with fondant. Any idea how long fondant can stay out in the open?

Thanks

That is pretty much the only way to do it as they can't be edible.Fondant will last for years if kept in a dry place and dusted often and not touched.