

Current rule for multiple transit TWOV/TVOA
Dear experts, could you please advise what the cureent rules are, in case I need to transit twice in China, but all within 24 hours? I will have some hours in Beijing then some hours in Chengdu. I'm a Hungarian national coming from Europe going to New Zealand. Is there still TWOV available or only TVOA? I read that from 2018 only TVOA is available, but I still read that TWOV is available also. I'm confused.
What are the conditions for leaving the airport and going into the city? I read that I need to apply for a temporary stay permit. What are the conditions for this? Is this permit free? Will I get this permit at all airports? (Beijing, Chengdu, Shanghai which I'm concerned about.)
On the way back I will then transit in Shanghai and Beijing, also some hours each place, but again, arriving and leaving China with 24 hours.
My point is, I don't want to get stuck at the airport for several hours, I hope here is a way!
Thank you for the answers.