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They packed up, told the security guard to head home, and locked the doors a few hours before closing time.

Efforts to limit emissions of planet warming gases were also up in the air, as the meeting went past the official closing time on Friday, with no indication of when agreement might be reached.

On a Sunday, gates open at noon, with the earlier closing time of 18:00.

Perhaps crucially though, the friends have ensured the arguments never get personal or followed them out of the pub door at closing time.

On Monday night, just 20 minutes before closing time, chaos erupted at the Ludu International Shopping Plaza in southwestern Shanghai’s Songjiang district.