TAKE A SIP: How long does it take to drink a margarita that large and how many people does it take to drink it? It sounds like a stumper, but there's an answer of sorts. The restaurant intends to keep the beverage around for a week or so after its debut. Meaning if you're in Vegas around the third week in October, you can try a few churny cold sips of the World's Largest Margarita. If you can't make it to Vegas, you can watch the making of the "Lucky Rita" online. But can you get that salty-sweet brain freeze from watching something online? Surely some internet pioneer is workng on that now.