From MSc to PhD in 2 year's time... in Spain this is the time you are expected to figure out what to research about. No doubt why Spain needs a bailout. So much to learn.
I don't think 2 years is typical for a PhD (even after already earning a M.Sc)
This may be just a sign of the quality of research Sergey was doing which has, as we know now, fairly useful applications :-)
Ah, someone else who didn't finish their doctorate and ended up working for Google instead. We're like kindred spirits, Sergey and I...