English version

it’s (only/just) a matter/question of time

From Longman Dictionary of Contemporary Englishit’s (only/just) a matter/question of timeit’s (only/just) a matter/question of timeused to say that something will definitely happen at some time in the future, but you do not know when I’ll find the key eventually. It’s just a question of time. It’s only a matter of time before we catch the person who killed her. time
Examples from the Corpus
it’s (only/just) a matter/question of timeBut they believe it's only a matter of time before the disease crosses the county boundary.If he hasn't already killed somebody, then it's only a matter of time.They think it's only a matter of time before he breaks.
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