I bought a train ticket online. Is it normal to notify by SMS before 9 o'clock tomorrow?

You didn't buy the ticket on 12306, but on the agency website, did you?

The railway will not open online ticket sales from 23: 00 to 7: 00 the next day (ticket sales at the station are normal), so 12306 website will not sell tickets during this time period. The agent website can place an order during this period, but you can't buy a ticket for you until 7: 00 the next morning after the railway ticket is opened. The agent website will inform you after the ticket purchase is successful. Because there may be many orders in the evening, which need to be notified one by one, the agency website will set a time limit, usually 9 o'clock. But maybe I'll let you know after I buy your ticket at seven o'clock.