only a question of time

only a question of time

or

just a question of time

COMMON If something is only a question of time or just a question of time, it will certainly happen at some time. It was only a question of time before news of the argument leaked out. There are some small groups fighting in parts of the city, but it is just a question of time until order is restored. Note: People sometimes just say that something is a question of time. It's a question of time before his designs are considered classic.
See also: of, question, time