LEO is relatively simple to destroy simply because it's already so populated with mass, and that population is growing rapidly, and because they all come pretty

LEO is relatively simple to destroy simply because it's already so populated with mass, and that population is growing rapidly, and because they all come pretty close to crossing each other's orbits. Collisions with even very small pieces of debris typically generate secondary debris, growing the population. A half-hour boost phase through LEO to get to higher orbit is dramatically less risky than spending 87600 hours there over a 10-year orbital lifespan. In the event that it all goes asymptotic, what sort of timescales would be afflicted by collision risks 10^6 or 10^9 or 10^12 greater than what exist now, I am uncertain.