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Just to give you a data point, I have about 39,000 miles on my car, do a lot of braking on my daily commute on a twisty road, have just about worn out two sets of front pads (already purchased my third set), and the front rotor minimum thickness is currently at 24.9 mm. It starts at 26 mm when new, and need to be replaced at 24 mm.
There is no substitute for measuring the rotor thickness and inspecting them for cracks and uneveness. Remember that the inner radius portion of the rotor wears more slowly than the outer. Make sure you get a caliper that will properly measure brake rotors - that is, it will get over the lip at the outer edge to measure the wear area.
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