I would say anywhere between 15k-80k, which I guess is kind of far out because 80k is a lot, but when you consider that a lot of novels published now range somewhere around 200k, if not way, way more than that. I'm not sure you need to worry about word count. A novella is just too big to be a short story and too small to be a novel. Poor novella needs a place!
“It's necessary to have wished for death in order to know how good it is to live.” ― Alexandre Dumas, The Count of Monte Cristo
I guess it't time for me to pull out my copy of the DVD of "The Revolution," and fast forward to Valley Forge for a nice visual. Ya know, totally submerse myself into the world of death. *waves flag unenthusiastically*