Hawaiian Lei - Purple Dendrobium Orchid Single lei is simply gorgeous. Made with Purple Dendrobium Orchids. There are approximately 45-50 Orchid blooms per lei. The Length of each lei is 38 inches. Packed nicely in boxes of either 25 or 50 lei. Dendrobium Orchid Leis are very durable and can last about 5-7 days or longer if stored in properly.