How much money can you win in one show of Jeopardy?

Roger Craig set a new single day cash record of $77,000 on Tuesday, September 14, 2010 see related link

Tournament Winners can not be considered to have won the money in one day though the day they win the tournament it is for much larger amounts of money.

Andy Richter won $68,000.00 yesterday. It was a Celebrity Match see related link

Roger Craig holds the record with the Tuesday September 14 2010 win of $77,000

Ken Jennings Holds the old record of $75,000 from July 23 2004 and also has 11 of the 14 games with scores of $50,000 or higher see related link

A link to the Jeopardy.com hall of Fame has been added below the answer credits under related links.
That is $77,000. The related link for Jeopardy High Games has the Official Jeopardy list of all the games with a one day total of $30,000 or more. Ken Jennings has 22 of the 41 games $40,000 or more