Join Date: Aug 2014
Location: 42.1% in PDX , 49.9% in PVG & 8% in the air somewhere prior to COVID. Now ~ 3% in the air going somewhere
Programs: Marriott Ambassador Elite & Lifetime Platinum, UA 1K, AS MVP GLD 75K, DL Pt, SWA ALP
Posts: 1,125
I am neither a museum, history, or sightseer but even for me I think Shanghai is worthy two days minimum.
Hangzhou is pretty historical and interesting, it could use a full day and half IMHO
Also have you budgeted time for time change? I'd hope you get those extra four days and spread them a day in each stop at minimum, stop and smell the roses so to speak