One month of training
A week later!
Feng Yun repeated the same routine for an entire week, he trained with her daily in the day, got beaten by her then healing before going to the formation room to train his will after that he would cultivate his soul the whole night. Although he didn't sleep for an entire week, it didn't matter much to him, with his cultivation, it won't affect his health if he didn't sleep an entire month.
Although his Qi cultivation didn't improve, his martial skill was improving leap and bound because of training. He somehow managed to endure the pressure of ten percent of Fan Xingjuan's Ice Domain.
Although Feng Yun was an excellent fighter, he still can't compare to Fan Xingjuan who was eight hundred years old, have vast combat experience. So he has much to learn from her.