This study uses multiple sources of data to examine the learning of leave-taking in Indonesian by twelve students from Australia during a sojourn of either four or seven weeks. The learners departed with very little knowledge of leave-taking routines. They rapidly learned the forms of certain routines, and used them often. However they did not learn suitable contexts for them, and also failed to learn a number of other common routines. Under influence of English, they relied excessively on statements of obligation for taking leave but also adopted one useful discourse marker. The study confirms that pragmatic routines are a site of rapid learning during study abroad, while suggesting some very common routines are hard to learn by naturalistic exposure. It confirms study abroad learners are often slow to learn to adjust forms to social context, and shows the powerful influence of L1 transfer on their pragmatic development. Keywords: study abroad, interlanguage pragmatics, leave-taking, Indonesian, pragmatic routines