Hi, I have a 6-month Multiple Entry L Visa which is valid until July 24, 2017.

I understand that I need to exit and re-enter mainland China within this period. A small stub attached to my passport says, "Visitor permitted to remain until April 23, 2017".

My question is: "Am I permitted to exit and re-enter the same day? I am planning to exit to Hong Kong in the morning of April 17th. Can I re-enter in the afternoon of April 17th?