If you are familiar with the transfer process, the train at the last station is not late, and you transfer at the same station, you should first check which platform the next train is. Generally, it is 15 minutes in time, but most trains will stop ticket checking 4-6 minutes in advance. It is not recommended to reserve only 15 minutes. Is it enough to transfer for 15 minutes? If the transfer time is urgent, you must take your personal luggage and wait at the door in advance.
Most railway stations are equipped with fast transfer channels. Transfer at the same station does not need to leave the station and then enter the station. If you don't know how to transfer, you can consult the staff in the station.
It is recommended to reserve more than 30 minutes for transfer at stations with large passenger flow. （DongCheHuanCheng15FenZhongGouMa）