The wheels of American justice turn slowly, inefficiently and ponderously, if at all. While this feature is often maddening to foreign companies used to their own more favorable and less predictable systems, it was certainly welcome to LVMH when it called off its plan to spend $16 billion on Tiffany & Co. earlier this month. After all, the unwanted deal was set to close on Nov. 24 and its antitrust clearance was due to expire on Feb. 3, and surely no American court could adjudicate such a complicated matter in so short a time. Why, LVMH was confident that the discovery and depositions alone would take well into next year, really rendering the whole thing moot, if you think about it.