A computer-implemented method comprising: accessing voice query log data that includes voice queries spoken by a particular user; based on the voice query log data that includes voice queries spoken by a particular user, determining a pause threshold from the voice query log data that includes voice queries spoken by the particular user; receiving, from the particular user, an utterance; determining that the particular user has stopped speaking for at least a period of time equal to the pause threshold; and based on determining that the particular user has stopped speaking for at least a period of time equal to the pause threshold, processing the utterance as a voice query, wherein determining the pause threshold from the voice query log data that includes voice queries spoken by the particular user comprises: determining, based on the voice query log data, a voice query experience score of the particular user indicative of a level of experience that a particular user has with voice queries; classifying the particular user as an expert user of a speech recognition system or as a novice user of the speech recognition system; and based on classifying the particular user as the expert user of the speech recognition system or as the novice user of the speech recognition system, determining the pause threshold, wherein the classifying the particular user is based on the voice query experience score of the particular user. accessing voice query log data that includes voice queries spoken by a particular user; based on the voice query log data that includes voice queries spoken by a particular user, determining a pause threshold from the voice query log data that includes voice queries spoken by the particular user; receiving, from the particular user, an utterance; determining that the particular user has stopped speaking for at least a period of time equal to the pause threshold; and based on determining that the particular user has stopped speaking for at least a period of time equal to the pause threshold, processing the utterance as a voice query, wherein determining the pause threshold from the voice query log data that includes voice queries spoken by the particular user comprises: determining, based on the voice query log data, a voice query experience score of the particular user indicative of a level of experience that a particular user has with voice queries; classifying the particular user as an expert user of a speech recognition system or as a novice user of the speech recognition system; and based on classifying the particular user as the expert user of the speech recognition system or as the novice user of the speech recognition system, determining the pause threshold, determining, based on the voice query log data, a voice query experience score of the particular user indicative of a level of experience that a particular user has with voice queries; classifying the particular user as an expert user of a speech recognition system or as a novice user of the speech recognition system; and based on classifying the particular user as the expert user of the speech recognition system or as the novice user of the speech recognition system, determining the pause threshold, wherein the classifying the particular user is based on the voice query experience score of the particular user.