The 90 days in a mental facility in Chino was not his sentence. That was an automatic mental evaluation for being labeled a Mentally Defective Sex Offender (MDSO) due to the fact that the girl who Polanski admitted raping was under the age of 14. The results of this evaluation was to be used in for sentencing. Polanski claims in retrospect that he was promised he would get time served. In the transcript of the plea hearing Polanski says both that he was promised nothing with respect to sentencing, and the he could still be sentenced to up to 20 years for the felony he was pleading guilty. There is no 48 days, there never was. I would hope that Saleten would have read all relevant publicly available court document before writing about a subject.