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There are different types of Session-State Modes. So the maximum Timeout value for Session differs accordingly. For details on types of Session-State Modes refer : http://msdn.microsoft.com/en-us/library/vstudio/ms178586%28v=vs.100%29.aspx
For InProc and StateServer mode the maximum timeout value is equal to one year
i.e. (60 minutes X 24 hours X 365 days = ) 525600
Note :Here one year is a normal year i.e. never a leap year. So, (60 minutes X 24 hours X 366 days = ) 527040 will throw exception. Infact 525601 will also throw exception.
For remaining types of Session-State Modes where session stores some values the maximum value is (int.MaxValue) the max value of an int data type, because Session.Timeout accepts int values.
The Timeout property cannot be set to a value greater than525,600 minutes (1 year). The default value is20 minutes.
Well as stated above by Vikram that it depends but for default session (in proc) default session timeout is20 minutes.
