In our case it's one hour, essentially based on "what if my home internet doesn't work and I have to get to the actual office to start responding, how long will

In our case it's one hour, essentially based on "what if my home internet doesn't work and I have to get to the actual office to start responding, how long will it take me to get there from anywhere in the city." You don't go on vacation or plan your wedding, but otherwise your day is pretty normal. I can't imagine less than 30 minutes.