Open up the following file in a text editor:
C:\Program Files (x86)\Inflectra\Rapise\Engine\SeSExecutor.js
Locate the following section:
// Execute test with 10 minutes timeout
var result = g_util.Run(commandLine, null, 10 * 60000, true);
and change the value of 10 * 60000 to a larger value (in milliseconds).
Regards
Adam