How long post SHTF before a city is safe to re enter?

[Hrusai]

depends on the situation, as a general rule i'd say give it 5 years MINIMUM, but tbh why would you wanna go back?....if you need supplies chances are they are already gone sure maybe medical facilities, but if you need to use a hospitals facilities, chances are none of you can use the equipment and the person is dead already

although if you insist, send a small group, and i mean no more than 3 people MAX they can move quickly and quietly to get where they gotta go, but if its a pandemic induced collapse, dont even bother going, its not only a suicide mission for those going, but if they get back they'll infect everyone else