How to change maximum number of requests per session?
By default, the maximum number of requests that session can send to server is 30. This number, if everything is done correctly, should never be reached. Remote calls are expensive, and the number of remote calls per "session" should be as small as possible. If the limit is reached, make sure that you don't misuse the session object.
Nevertheless, if needed, this number can be changed for a single session or for all the sessions.
To change the maximum number of requests in a single session just manipulate MaxNumberOfRequestsPerSession property value from the Advanced session operations.