Found this link; big yikes about how long it stays around;
Blockquote 4. How long can the virus live outside of the horse’s body? This includes on clothing, footwear, walls, buckets, tack, etc.
The virus can survive up to 7 days in the environment under normal circumstances but can remain alive for a maximum of one month under perfect environmental conditions. The most important measure is to first clean equipment and horse housing areas. (Please note: It is important to wash and rinse surfaces when possible prior to applying disinfectants.) Cleaning first allows for removal or organic material which makes the disinfectants more effective. After cleaning the surface, follow with a disinfection process. The virus is easily killed in the environment by most disinfectants. Conventional disinfectants and detergents are the best. It is important to perform hand hygiene (wash hands with soap and dry thoroughly or use alcohol based hand sanitizer) when moving between horses that are grouped separately to avoid spreading pathogens that may contaminate your hands.