I’d like to be optimistic and say we’d have about a week before things started getting Mad Max-y out here in the suburbs.
I think a lot of survivalist planning seems to forget that few of us live somewhere so far out that we don't need to account for our neighbors actions.
I grew up 45 minutes away from Boston and all of the neighbors had standby generators. Even more have wood stoves. Water is abundant. Actually a lot of the old houses were built pre electrification or shortly after so there’s no limit to how long you could survive without the grid.