About 24 hours. The descending needle cannot be stored at high temperature. Generally speaking, it needs to be stored below 25 degrees. If it is not stored in cold storage, it will affect the efficacy and will be ineffective in about 4 hours. Long-term storage needs to be kept in a refrigerator at 2-8℃. However, the internal temperature of the refrigerator will rise to about 10℃ after 2 hours of power failure, and the fresh-keeping time should not exceed 3 hours. The refrigerator with power failure for 5 days will be consistent with the room temperature, while the lipid-lowering needle can be stored for about 24 hours at room temperature below 25 degrees. Therefore, the lipid-lowering needle can be stored for about 24 hours without deterioration after 5 days of power failure in the refrigerator.