The fast generation of PoS block is still ongoing, about 55 out of last 60 blocks, and in the amount of 250/500 PPC, so I presume it's the same person.
This is me. It's a wallet I created by sending approximately 250-500 PPC every 5-10 minutes over the period of a month. The actual amount and time depended on how much PPC I had available. I kept this running on a 24x7 node and it averaged about 150 blocks immature constantly after about 40 days. The machine it was on had a hard drive failure and it's been offline for a week or so. Having recovered the wallet from backup I've fired it up again and I guess it's catching up. For the curious the ppcoind node this runs on uses about 80% CPU idling - I assume that POS stack code takes a bit of CPU while cycling through so many transactions.
Thanks for the details on how the system actually works. As most of us would not have had enough PPC or the time dedicated to test it empirically.