Here's an interesting link
on the time in jail real spies received.
From the article:
William Colton Millay, 16 years for attempting to sell secrets to a Russian spy. (This is from this year.)
David Henry Barnett, 18 years for selling classified documents to Soviet officials.
Harold James Nicholson, 23 years for providing highly classified information to Russia.
Ana Belen Montes, 25 years for passing classified information to Cuba's government.
Earl Edwin Pitts, 27 years for giving classified information to Russian intelligence services.
Michael Peri, 30 years for passing defense secrets to communist East Germany.
Clayton Lonetree, 30 years for delivering classified information from American embassies to Soviet agents.
Albert Sombolay, 34 years for giving a Jordanian intelligence agent key information about the U.S. military buildup ahead of the first Gulf War.
Many of these people did not serve their entire sentence. Kind of puts Manning's sentence in perspective. He'd have been better off giving the info to Russia.