jrv's memory didn't fail him on that one, HIV can make it a few hours. if you don't kill them, they don't dry up, and they survive outside of shit like biting insects, a bunch of viruses can survive several weeks-months, some even on ambient surfaces like metal.
they don't need to eat, breathe, maintain traditional homeostasis-obviously they're related to keith richards.

anyhow, stuff that would be in your poop or clear/mucosal fluids like the rotoviruses are exactly what's getting on something like a dildo, so don't share them or stick it in your fucking mouth, aids scare or not. thankfully, all the scary filovirus-type stuff doesn't last very long outside a host, so claiming you've got marburg or ebola isn't a legit excuse for porn girls flaking in the future