Answered by Borut | Sep. 21, 2023 00:06
Emil, I have already answered on the other side of the forum, so I will just copy and paste my answer from there, so that you know how to plan your visits to Guangdong province:
As already mentioned, there is no limit on the number of how many times you can enjoy 144 hour visa free transit scheme. In reality, the answer is, use them as much as you wish.
When you exit to Hong Kong by ferry, you will have an overnight and that will be perfectly enough to return back to Guangdong province.
Here one extremely important detail. To be eligible for 144 hour visa free transit when entering Guangdong province you always have to fly into it regardless if we are talking about very far countries/territories or a nearby Hong Kong. So, count on the nonstop flight from Hong Kong to Guangzhou as the only eligible way to enter Guangdong province. As you can see, you can exit by ferry, but the entry is by air only. After your stay in Guangdong province, you will fly to Taiwan.