Whenever Analyzer sends a request to another party to process, the HttpRuntime executionTimeout value countdown kicks in. If Analyzer does not get an answer back within the timeout value it then timeout waiting. For example whenever Analyzer sends a query to SSAS for result it starts the countdown for timeout.
By default this value is set to 110 seconds. To change this value please open Analyzer's Web.config file found in \program files\analyzer\web folder. Search for the word "HttpRuntime". You should see a line similar to this:
<httpRuntime maxRequestLength="50000" />
or similar to this:
<httpRuntime executionTimeout="600" maxRequestLength="50000" />
If you do not see "executionTimeout" in yours then add it yourself. The value is in seconds so in the "600" example above is equals to 10 minutes.