I think this rise to 2.25 is only the beginning, and we'll see the real gains in a week or so, when all those people reading about ppc now, finally manage to get some money in.
2 DAYS OR SO FOR DECIDING TO BUY SOME
3-5 DAYS FOR DEPOSITING FUNDS.
This, people need to realize that the article isnt big news for people that already are invested in cryptocurrency, but for those who haven't. So I'd expect that in a week or two the most popular altcoins (PPC, XPM, LTC) will rise.