Im planning my Asia trip currently. This is how it looks:

June 1 depart jfk
2 arrive tokyo, depart tokyo, arrive beijing
3-5 beijing
6 depart beijing, arrive shanghai
7-9 shanghai
10 depart shanghai, arrive hongkong
11-13 hong kong
14 depart hong kong, arrive tokyo
15-17 tokyo
18 depart tokyo, arrive jfk


Unfortuneatly, I can leave for that long, so Im planning on cutting each place down a day, so 2 FULL days in each place. Is that enough time? Should I take a place out? And if so, which one?