You should see some of the model jets that are around. I went to an air show of model jets in Arizona, those things are insane - $10K radio controlled jet airplanes, that go 200+ mph.
Gets them out in 4 minutes? Uh, I think 4 seconds should be their target. Maybe 40 seconds, if it includes unbuckling from their seats in the rocket, climbing out, and scrambling for their roller coaster seat. Once in, it should only take them about 10 seconds to plummet a reasonable distance underground, which could then go horizontal and work on getting them further away from the rocket.
GJ said about 17 hours later
I don't think it's a free-fall plummet. Don't know for sure, but if it's meant to evac injured personnel, that last thing you want to do is put them on the roller coaster of death. :)
Steve said 1 day later
Injured personnel? Why the rush then? I thought it was for evacuating personnel if the rocket is about to explode, collapse, or have some other catastrophic event.