When SHTF, such as getting stuck in a cave, in an unfamiliar and not very friendly environment, the number 1 thing to worry about is the state of mind.
The post SHTF effects can last from 72 hours to a few months. It is impossible to establish how much a crisis can last since there are always unknown factors.
A massive solar flare hitting us directly would have the exact-same effect as an EMP attack from North Korea, Russia or whatever “axis of the evil” by the way.
When Survivopedia readers were asked what the greatest threat was in their neighborhoods, the number one answer was… gangs! I can’t say I’m surprised at that.