Hi, Can someone please tell me how long does it takes for a cruise from chongqing to wuhan?

I just know the cruise from Chongqing to Yichang (possibly, you are referring to this). It leaves from Chongqing Chaotianmen Port and arrives at Yichang New Century Port.

There are many cruises in operation. You may check the schedule and timing through this link:
https://www.travelchinaguide.com/cruise/sailing-date1.htm

And the downstream takes 4D3N and upstream takes 5D4N I remember.

Thanks Albert. It did helps though.