Questions & Answers about זה לא עניין של כסף; זה עניין של זמן.
Here עניין means matter, issue, or question of.
So זה עניין של כסף is literally something like it’s a matter of money, and זה עניין של זמן is it’s a matter of time.
A very important point is that עניין does not always mean interesting or interest in the emotional sense. It often means a subject, issue, or matter.
Examples:
- זה עניין חשוב — This is an important matter
- אין לי עניין בזה — I have no interest in this
- זה עניין של זמן — It’s a matter of time
So the word is flexible, and in your sentence it clearly means matter / issue.