Your limit is how long it takes them to find somewhere safe for their family. I evacuated and got back online later that day. Several leaders reached out to me to ask if I needed anything or if I wanted to take time off. In response, I feel more allegiance, and want to work harder. I love my job even more than I did 3 days ago.
Treat others how you would like to be treated. Respect breeds respect.
Ideally yes. And the limit is until things are stable.
But if you need a discrete answer, probably a few months? If we're in an emergency situation as a tech industry for more than a month, something much dire than business has happened. Many tech companies rebounded from COVID in a few months times.