Tens of minutes on average. Most BTSes are battery-backed, without generators. (Home wifi could work, but the usefulness of an island system is limited. Outer

Tens of minutes on average. Most BTSes are battery-backed, without generators. (Home wifi could work, but the usefulness of an island system is limited. Outer link also worked last time, but what good is that when the other end is not even on UPS? Next hop was optical, but who knows how that is powered and whence.)