Re: How long does it take?
I winterized a few this past winter on the shorter Raja Puri and Dwarf Cavendish by filling leaf bags with grass clippings and leaves and stacking next to the stems and wrapping them with line and tape. I have my first bunch of Raja Puri almost ready to eat.
The Raja Puri did well but the smallish Dwarf Cavendish still froze.
It would be harder to do this with the taller bananas.