Diptyque 2.5 oz. Baies Hourglass Diffuser Driven by a spirit of innovation, diptyque has reinvented the concept of home fragrance with the hourglass diffuser. Just turn it over to begin a new diffusion cycle lasting approximately one hour and enjoy a delightful sensory experience: the diptyque hour. Ideal for scenting small spaces over a period of several months until the fragrance evaporates completely, it can then be refilled one time with the same scent. The irresistible freshness of a bou.