Usually one is advised that the tie should reach the belt buckle or the waistband of the trousers. I have never noticed any of the Danny Ocean gang wearing an overly long tie, but I will now keep my eyes open. It would come as a surprise, since I tend to expect the two stars you mention to be impeccable in sartorial areas. I know Mr. Clooney is an Armani aficionado, and I have noted in recent years that Italian ties tend to run long. This is because many Italians like to wear a big knot, and that may involve a few extra loops. I think you should keep wearing your tie as you have in the past. The last thing you want to do is get your tie stuck in your fly or pee on the thing.