You have to construct a test for your app in order to see if recognition accuracy is reduced as a result of pauses. It isn’t difficult: you can turn on verbose output and use this method to submit recordings with and without pauses and look at the results:
- (void) runRecognitionOnWavFileAtPath: (NSString *) wavPath usingLanguageModelAtPath: (NSString *) languageModelPath dictionaryAtPath: (NSString *) dictionaryPath languageModelIsJSGF: (BOOL) languageModelIsJSGF
If you need to gather input recordings you can make them using the SaveThatWave demo.