I never claimed that, I only made the argument that the terrain and population won't be the hard part. Iran is well prepared for this invasion, so it will be harder, but the US military is also the most well-practiced, well-armed, and well-funded military in history, so harder is kind of relative. I doubt it will take a year, and I don't think it will take a month, that's as accurate as I think my educated guess can be.