Hi Primrose
Greeting from Peggy, Top China Travel.
There is no a 2-3 day tour of Yangtze River.
For Yangtze River cruise, the shortest one is from Chongqing to Yichang 4 days 3 nights. The longest one is from Shanghai to Chongqing 9 days 8 nights.
That means if your tour includes Yangtze River cruise, the shortest one will be at least 4 days.
For Yangtze River cruise route, you can see details on
/yangtze-cruise/yangtze-cruise-routes.htm
Peggy
Top China Travel