Take K692/K693 train and get off at Beibei Station for 6 hours.
Beibei Station to Chongqing North Station 1 hour 43 minutes.
Take the K620 train and get off at Fuyang Station for 20 hours.
The above scheme is the most time-saving.
It takes 10 hour to transfer from Hefei to Fuyang, and it takes 3 hours!