Dear Claudia Sotelo,
Thanks for contacting Top China Travel!
If you are arriving at 3.30PM on Oct. 15, you should return on the 18th at 3.40pm, not on the 19th at 3.40pm. 72 hours equals 3 days. And the 72 hours refers to A connecting air ticket of leaving above Beijing Capital airports within 72 hours. The 72-hours visa free time is valid since you finish the visa-free procedure but not the arriving time of your plane to above cities
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