The duration column for audit logout is the total duration of the connection. It's not the time it took for the logout operation. So if you have a connection that's been open 23 hours, the duration column for audit logout will show 23 hours.
This probably isn't the cause of your timeout issues.
K. Brian Kelley
http://www.truthsolutions.com/
Author: Start to Finish Guide to SQL Server Performance Monitoring
http://www.netimpress.com/shop/product.asp?ProductID=NI-SQL1
K. Brian Kelley
@kbriankelley