The rest of his life in prison? You'll be sorely wrong by a long shot. Have you looked at any precedents? Jeff Skilling, for one, is already out. More recently, Elizabeth Holmes only received 11 years.
Overestimating I think - he's 30 according to wikipedia, so 20 years is 50, unless you're taking into account some early release or parole program.
according to the state of California it cost them over $106 thousand per inmate per year. Surely at that price letting them take care of themselves is better for any nonviolent crime, or any crime where the odds of recidivism during their sentence while under house arrest is sufficiently low?
I think it's fairly standard if you were released on bail prior to sentencing, but I don't have the statistics
Btw legendary monologue https://www.youtube.com/watch?v=TgL_5QcZCMo