Research has shown that L2 utterances diverge increasingly from target language phoneticnorms as the age of L2 learning increases. Other research has suggested that L2 speakers producelonger utterances than native speakers. The aim of this study was to determine whether L2utterance durations increase as age of learning increases. Fluently produced English sentencesspoken by 240 native speakers of both Italian and Korean (selected on the basis of age of arrival[AOA]) were examined. For both L1 groups, the duration of English sentences waspositively correlated with AOA. The AOA effect was found to be significant even whenconfounding variables were partialed out. These results are taken as preliminary support for theproposal that the more established the L1 is at the time of first exposure to the L2, the more itwill interfere with L2 production, thus requiring greater processing resources to suppress it.