26. The non-transitory computer-readable storage medium of claim 20 , further comprising program code to normalize the duration score using a number of speech units in an utterance comprising the single speech unit.
20. A non-transitory computer-readable storage medium storing processor-executable instructions for controlling a computing device, comprising: program code to cause an automated speech recognition (ASR) module, configured to convert audio data to text data, of the computing device to transform the audio data received by the computing device into a sequence of speech units represented in the audio data; program code to determine a first duration of the sequence of speech units of the received audio data; program code to determine, using the first duration, an expected duration of a single speech unit of the received audio data in the sequence of speech units; program code to determine, by the ASR module, a second duration of the single speech unit; program code to determine a duration score of the single speech unit, the duration score corresponding to the second duration in relation to the expected duration; and program code to determine a speech recognition result based at least in part on the duration score of the single speech unit, wherein the speech recognition result is the text data corresponding to the received audio data representing speech; and program code to cause a command to be executed using the text data.