The amount of time it takes for crystals to work can vary and is largely dependent on how they are used and what they are being used for. In spiritual and holistic practices, crystals are often used for healing, meditation, and spiritual growth, and the effects can range from immediate to gradual. Some people may feel the effects of crystals immediately, while others may take longer to feel the effects. In general, it is recommended to use crystals regularly and consistently, and to trust the process and let the crystals work in their own time. It's also important to remember that everyone's experiences with crystals are unique, and what works for one person may not work for another.