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Other than it being 3.5" or 4" (not much difference) it's a case of how hard the concrete is. Some place where it doesn't matter, you could try whacking away at it it a cold chistle and hammer. Only a few millimeters (5mm or at the most 10mm) should be able to be chipped off if it's good stuff.
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Totally agreed. I drilled the pilot holes and thought that the concrete was rather soft. I was able to go through it pretty easily. I think I was more concerned with its softness than its depth. But the depth doesn't help either.