Plastic is worrisome because it's ubiquitous in the modern world. I've read it's 72 hours for plastic and possibly 96 hours for glass.

There may be newer and more precise figures than these, which were based on SARS:

Maximum time SARS-coronavirus can live on various surfaces at room temperature
The novel coronavirus that causes Covid-19 is a close relative of SARS and likely has a similar lifespan on surfaces.

Surface Hours
Plastered wall 36
Formica (laminate material on counter tops) 36
Plastic 72
Stainless steel 72
Glass 96

https://qz.com/1810508/covid-19-can-likely-live-up-to-96-hours-on-your-phone/

Dr. Fauci said (initially at least) not to worry so much about mail because if there's virus on it, it would be attenuated or degraded by the time it gets to you, but he didn't account for what happens if your mail carrier or a sorter close to your house has it. I let everything coming into the house sit for a couple of days unless it's urgent.