25 years is not enough, for the victims and the prosecutors are expecting at least 50 years jail sentence, in fact at the time that he is free he is only 57 years still young to enjoy the billions of dollars he scammed from his investors, he can enjoy of the rest of his life.
Just imagine he will have to wait for 25 years and then enjoy the money for 25 years or more, it sent the wrong signal that you can scam spend a few years in jail and enjoy for the rest of your life the money you scam.