Rainforest Rub 30ml soft wax does far more than a panel, you see, even if it contains just 30ml of wax. Most people see 3-4 coats of wax on an average sized car, and you may even get 7-9 coats on something smaller. A great introduction to the Dodo Juice range, and superb value for money.
Wax wise, this is a blend of T1 carnauba, beeswax and candelilla wax and will give 2-3 months of longevity. Recoat, or top up with a spray sealant, at that point.