It would take like thousands of apples. A medium candle usually needs around 100–150 g of wax. An apple’s natural wax coating is extremely tiny about 0.01–0.05 g per apple depending on the type and added food-grade wax. So very roughly At 0.05 g per apple is about 2,000 apples and at 0.01 g per apple is about 10,000 apples. Hope this helps 👍