Answered by ZUPAN
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Nov. 26, 2019 11:32
Your first itinerary, if it is within 24 hours, counting from your scheduled landing in Changsha, until your departure from Xi'an, is definitely eligible for 24 hour visa free transit and you don't need any kind of visa. I assume that you will use MU2046 from Singapore to Changsha and MU785 from Xi'an to Prague and if I'm right, this is perfect example of 24 hour visa free transit.
Your second itinerary, quite contrary is not eligible for any kind of visa free transit scheme. The reason is simple. If you have two consecutive stops within mainland China, as you have in your first itinerary, you can only be eligible for 24 hour visa free transit. Anyway, you plan to spend two days in Shanghai after you have already had a stop in Xi'an, so this itinerary requires a Chinese visa obtained in advance. The basic rule for 72 and 144 hour visa free transit clearly says that the immediate cities before and after your Chinese destination have to be in different foreign countries. As you can see, Xi'an is not in a foreign country.
So, you will have to obtain a Chinese visa in advance for your second itinerary or change it to be eligible for 24 or 144 hour visa free transit.
By the way, if you are a Singaporean citizen, you don't have to bother yourself about these details because you are allowed to travel through and to China visa free.