if you say that it is only a matter of time before something happens, you mean that you are sure it is going to happen, although you do not know when.

It is only a matter of time before he is forced to resign. (usually + before)

I know she will be a great novelist. It is only a matter of time.

• have had more than fair share of
• have had more than fair share of something
• have had more than has had hot dinners
• have had more than someone has had hot dinners
• have had more than your fair share of
• have had more than your fair share of something
• have had your chips
• have had your day
• have had your fill
• have had your fill of
• have had your fill of something
• have half a mind
• have half a mind to
• have half a mind to do something
• have half an ear on
• have half an ear on something
• have half an eye on
• have half an eye on someone
• have half an eye on something
• have hand in the till
• have hands full
• have hanging over head
• have hanging over your head
• have head in the clouds
• have head screwed on