Your new drums should last the life of your car. Just inspect them once every couple of years (or 40K miles or so) and don't wait until you hear them grinding. You'll be fine.
The one thing a bit unique about the factory brake shoes on a Mirage is that they have the thinnest amount of friction material (the part that wears down) of any brake shoes I've ever seen. If you have never seen Mirage drum brakes before, the shoes almost look 50% worn when they're brand new. That's what I thought when I took this picture of my 2015 rear brakes when my car was new...
This is the smallest car I've ever owned so maybe this is typical for tiny car drum brakes?!?
View my fuel log 2015 Mirage ES 1.2 manual: 52.1 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)