While it's an amazing progress, make sure not to overdo it. Muscles get used to increased stress quickly, but joints (especially knees) and tendons not so much - and those also heal much slower after a stress-induced injury.
A really good point! I'd run a bit in the past - though not to this extent - and it's amazing the degree to which injury management becomes a part of running. I'm definitely an amateur compared to most people, but I've already learned so much about random human anatomy each time something breaks...