That means any items you buy in a supermarket (greens wrapped in plastic, toilet paper, packaged meet, tin cans) should be set aside at home for 3 days? And you need to disinfect yourself after each round to the store...
If I read this paper right, viruses on surfaces/aerosols decay exponentially (so no specific "life-time") and they determined the half-lives here. Start with more particles and you reach the detection threshold later.
To figure out when all viral particles are inactive you'd have to know how many particles you'd typically start with. I doubt that the amount of particles they spread on the surfaces is typical of what an infected person would spread.
However the main issue is that protecting yourself from the UV blast might be more complicated than just disinfecting the product using traditional means