It varies widely (or, wildly). Parts of the forest not far from us looked almost the same a year later, many sections were similar but more open without all the woody undergrowth (e.g. scrub oak) some of which is still recovering 10 years later, and sections of the fire scar in the hills west of us still look like the moon's surface 12+ years later. I don't think one can make a general statement on recovery time as there are too many variables.
Some troubling academic ideas and misconceptions on emergency planning are inevitable. Emergency action, even more so.
Mount St Helens was a turning point in US handling of natural disasters. Continental, outlying territories, as well assistance proffered internationally. 57 people died because they refused to leave. Where ample warning aligns with *accessible* areas. Failure to respond to evacuation orders naturally follows in severity to level of government directly involved in enforcing it. When given Federal authorization - local, county, and state police act accordingly. Those (civilians) acting under a federal agency can be assessed powers to act within highly defined parameters as well.
When you reach a point meter maids and city personnel are delivering notices/aid under their local civic commitments. Refusal to evacuate will garner attention by imposing and fully empowered agencies capable of providing this service.
*When a helicopter lands or lowers rescue equipment in remote areas. They are no longer making advisements. Failure will not be an option in the event defining second contact.
