The rule of thumb is roughly 25 % of the drink in ice. Knowing how much ice you need is one thing, how fast if cools your drink is another. At the molecular scale, right at the contact surface of the ice, heat is taken up almost instantly. If you want a whole bottle cold fast but without diluting it, there is another route, the ice water bath. Overall you need to wait 5 minutes with ice, 30 minutes in ice water, or 3 hours in the fridge for a cold drink.