L’adverbial en X temps, est-il vraiment un test de télicité ?

The French adverbial PP en X temps is often considered telicity test. The present paper address the question of its reliability : how can we be sure that a VP is telic as long as it is compatible with en X temps ? Corpus data investigated in the article provide evidence that the supposed telicity test often appears in clearly atelic contexts. Further investigation of the linguistic features of the PP under analysis in such contexts leads to the conclusion that there is no reason to rise the adverbial clause en X temps to the rank of telicity test.