The Peruvian Supreme court ruled in June, 2012 the U.S. would have to wait until his finished serving his sentence, but Judge Stein's comment is confirmation nothing's changed in that respect.
Since Van der Sloot got a 2 year sentence break at the time he was sentenced for his "sincere confession" and early termination of the trial, his lawyer says he likely is eligible for release on parole after serving 1/3 of his sentence, or 9 years. In addition, he may be eligible for good time through "prison benefits) which could cut a few more years off his sentence.
"Van Der Sloot is eligible for probation is a third of the sentence, because he meets all requirements. He could receive the benefits (prison) and could come out with a third of his sentence (approximately nine years)."
That was my understanding at the time he was sentenced, but I also wondered, after reading the Code (in Google translator, not the best) when the extradition request was made whether the extra prison benefits might not apply to an inmate with a detainer.
So, bottom line is Van der Sloot didn't get an extra cut in his sentence, but his reduction from 30 to 28 years for his "conclusio anticipado" is now secure, which should mean he is eligible for release after 9 years, and possibly more with prison benefits. In addition, his lawyer says his request to marry a Peruvian woman has been approved (he's already allowed conjugal visits, as those are allowed for common law relationships.) He'd also get credit for the time he spent in prison awaiting trial.
There's a possibility he could avoid extradition altogether once he's married to a Peruvian and applies for citizenship.
His restitution to the Flores family was also affirmed. If that has to be paid before extradition, the U.S. could wait even longer for his arrival.
Last item: He still has an appeal pending before the Corte Interamericana de Derechos Humano (International Court of Human Rights) in which he is requesting the Peruvian sentence and conviction be set aside. I don't see that appeal as having much chance.
[No character attacks on Joran Van der Sloot please, we don't allow them on anyone. If you have an opinion, please be civil.]