Hi Eddy,
It will be difficult to understand the issue w/o a bit more details. Please describe the situation, e.g. what is the InfoSet doing (which InfoProviders, type of join, how much data to process).
I suggest to analyze the generated SQL behind the BEx Query. Please run t/code RSRT for the respective BEx Query and search for a function like Explain SQL. This might give you a better understanding why you get a time out.
Best regards,
Sander