That time is in debt/owes the subject of the question to [someone/something]. So,
"Yes, if we are patient" can be used to the same effect, but
"Yes, it is long overdue" means the same thing, but...
The phrase "mean mug" is usually found in literature.The word "mug" in this context is a slang word for face and the phrase "mean mug" is generally meant to convey a description of a face as cruel,...
It means that the person is as important to you as is the entire world. You care for them as much or more than all of the wealth in the world. That they are your world and your interests revolve...