Its that 'secondhand ebola' that I do NOT have ANY 'clear' official data on.
The most detailed information I have is a 39 page entry on "Viral Hemorrhagic Fevers" (of which ebola is one).
This is the closest it gets to an answer to that:
".....at minimum, isolation measures should include the following:
--Restricted access to the patient and use of stringent barrier nursing including mask, gown, glove, and needle precautions.
--Proper hazard labeling of all specimens submitted to the clinical laboratory with notification of appropriate clinical personnel.
--Proper disposal of all material within the isolation room by autoclaving or liberal disinfection of contaminated materials using such disinfectants as hypochlorite or phenols.
I can deduce from that, that there IS a hazard of infection from fluids from the sick even if the sick guy is not in the room, but no answer is provided on how long the hazard stays potent.
If I had to guess, I'd say hours, or perhaps days, although could be minutes or weeks depending on circumstances. Some viruses last longer than others outside the body. The impression I get reading between lines is that ebola does not last long outside a 'host', but it lasts at least minutes (minimum).