Are you looking for connection timeout in the connection string?
When the connection is closed, the pooling service determines whether the connection has exceeded the connection value of the Lifetime attribute. If so, the connection is closed; otherwise, the connection returns to the pool connection. (Http://www.connectionstrings.com/oracle)
or are you looking for CommandTimeout in a command element?
Specifies the number of seconds the command is allowed to execute before terminating the execution with an exception
I think that for a long query you need to extend the CommandTimeout property ... however, by default it is 0 (no limit), so you can check that
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