I said it was hard because I was thrashing it. In one of those months, I left Windows Update running while my phone was tethered. During the summer, I was using Spotify every day, on the walk to work and on the walk home again. Even under such heavy usage I didn't get close, I think a very small percentage of people use more than half a gig (which begs the question, why bother limiting it in the first place if most people don't touch it?)