It depends on the density of the liquid. One fluid ounce is actually a measure of volume, not of weight. Thus a fluid ounce of, say, molten lead would weigh more than a fluid ounce of water. For instance... If you're converting water, 1 U.S. fluid ounce of water has a mass of roughly 30 grams. Therefore 30 grams of water is about .06 pounds.
Square Root of a MillionThe square root of a million is 1,000.
It is not possible to answer this question because people find different things easy or difficult. What you find easy I might find difficult, and conversely.
It would depend on the speed you were traveling but I think it could be done in less than a second. This is assuming you are at the exact end point of one state and immediately cross directly over the border to the other state.