From the London Daily Mail:
Ebola can survive on surfaces for almost TWO MONTHS: Tests reveal certain strains survive for weeks when stored at low temperatures
The number of confirmed Ebola cases passed the 10,000 mark over the weekend, despite efforts to curb its spread.
And while the disease typically dies on surfaces within hours, research has discovered it can survive for more than seven weeks under certain conditions.
During tests, the UK’s Defense Science and Technology Laboratory (DSTL) found that the Zaire strain will live on samples stored on glass at low temperatures for as long as 50 days.
I would be a lot more reassured if they just came out and said: "At this point, we do not know." People who get the first message (It does not last more than an hour or two on dry surfaces) may not get this second message and people could contract it.