Don't know the highest amount won in a round except the 1,000,000 for the Bonus round by Michelle Loewenstein. There was a loss of $62,400 because she could not solve the quotation puzzle on October 14 2008. There is even a video of the ironic loss in the related link
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The amount varies from game to game
Do you mean how often the single Wheel of Fortune space for lose a turn on the Wheel comes up. They do not keep statistics and provide them to the viewers on the frequency of the spin ending on a particular space
Why would there be a record of that or for that
They win at least $1000 if they did not win more playing the game. It is Jeopardy that has a set amount and for Wheel of Fortune you keep what ever you win and get the $1000 only if you failed to answer any puzzles because $1,000 is also the minimum for solving a puzzle on Wheel of Fortune.
Wheel of fortune does not provide contestant information