Three or four days. According to Baiyun's query. Com, four-day delivery, also known as SF land transportation, refers to cross-regional delivery in China Province, that is, it will arrive within 72 hours after delivery and be delivered within 4 days at the latest. The time limit for delivery shall be calculated from the time of receipt. Therefore, it takes three to four days for Lanzhou Qilihe to send SF Express to Xi 'an.