Could you give us a link to the site which says five days?
http://www.phac-aspc.gc.ca/lab-bio/res/psds-ftss/ebola-eng.php
“SURVIVAL OUTSIDE HOST: The virus can survive in liquid or dried material for a number of days”
http://www.eva.mpg.de/primat/ebola_workshop/pdf/Leroy_et_alScience.pdf
Different sources say different time periods as it varies on the conditions. The link the the Canadian health Dept sheet says several days. I can’t find the one that said 5 days.
For areas which get sunlight it would be less. Areas with AC it might be more. If its dried it can still revive.