Your energy 66 multiply with 6 and you get 11. 11 times 12 and you get 132. 132 times 8 is 1056.
So it will take you 8 times to spend your full energy of 66 for 1056 pet experience at cost of 6 energy per game and winning 12 pet experience per game. If you train your pet once a day then think of it as 8 days to get 1056 pet experience. To spend your all energy you will have to play 11 games at cost of 6 energy per game. I hope i helped.
Michael BlueBright, Exalted Conjurer, Technomancer