6 hrs is the best research I have seen. If they crap on the floor that is infective for 2 days. My best guess from what I have read is it needs to be in some sort of liquid. Dry it out and no longer infective. No wonder the dead with all the liquid and viral load in them are as infective. No idea as if you rehydrate it if it becomes infective again. God forbid that is true.
Ebola like viruses can be freeze dried and reconstituted, but it is not easy.