We keep glass and batteries for the models this island actually carries: two years of a common flagship, and the mid range phones that sell in every shop on the road.
If your model is in the drawer, a screen is an hour and a battery is forty minutes. If it is not, the job becomes a booking for the day the part lands, which is usually about a week, and we will tell you that at the counter rather than take the phone and let you wonder.
We do not fit the cheapest panel we can find. There are three grades of replacement glass on the market and the cheap one looks fine on the counter and yellow in six months. We fit the middle grade, we tell you it is a replacement rather than the original, and the warranty is ninety days on the part and the fitting.