a question of time Meaning You can say 'it's only a question | English Language

a question of time

Meaning
You can say "it's only a question of time" before saying what you think will happen in the future

For example

It's only a question of time until we run out of oil, so we're going to need other forms of energy to power our cars.

If you keep on spending money like this, it'll just be a question of time before you have a serious debt problem.

Note
This idiom is almost always used with the word "only" or with the word "just", as in "It's only a question of time before ... " or "It's just a question of time."
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