18 months. The shelf life of West Lake Longjing is 18 months. Long-term storage of West Lake Longjing will absorb moisture, lead to deterioration, and may be moldy, which is no longer suitable for drinking. The storage time of sealed Longjing is slightly longer than that of bulk Longjing. Longjing can be stored in sealed plastic bags. Don't expose it to the sun, it is easy to deteriorate. West Lake Longjing, which has been stored for more than one and a half years, will increase its water content and deteriorate because it absorbs water from the air. If it is stored for a long time, it will be moldy and no longer suitable for drinking.