I think People’s Square in Shanghai is getting a bad rap on here. It’s not too bad distance wise if you can put up with the crowds. Pre-Covid I had no issues changing from line 1 to 2 coming or going to PVG. I’d even say the line 1 to line 10 transfer at Shanxi South station is worse. The absolute worst in shanghai is Xujiahui line 1 to line 9. Gotta be at least a KM.

Beijing Guomao I remember being a pain as well as Xizhimen line 2 to line 13. Shenzhen has some pretty long connections as far as I remember. HK Central station is also rough going from Island line to the one that goes to the Airport.