Aaron Swartz faced 13 federal felonies (the Feds upped it from 4 to 13 at some point) and a possible maximum of 50+ years in prison: https://www.techdirt.com/articles/20120917/17393320412/us-go...
Then there's the No Electronic Theft Act, which Clinton signed into law. It made not-for-profit copyright infringement -- think sharing on P2P networks -- a federal felony. Previously it was a civil matter.
Now <gvb> is correct that there are sentencing guidelines that will make the likely sentence less. But even the outside possibility of a young man or woman leaving prison when they're 70-80+ years old for a non-violent crime is remarkable. (Note I'm not defending Paul Ceglia, who may well have committed fraud and should pay the price if convicted; I'm merely saying that the punishment should correspond to the gravity of the offense.)
These are DOJ stats for the year 2000, but it gives you an idea of the range for violent felonies: "The mean prison sentence for murder and nonnegligent manslaughter was nearly 20 years and 8 months." http://www.bjs.gov/content/pub/ascii/Fssc00.txt
Harvey Silverglate's book "Three Felonies a Day" is an excellent resource, and I separately wrote about the overcriminalization of federal law here: http://www.cnet.com/news/from-wargames-to-aaron-swartz-how-u...