You can use the following setup:
A: 58R 104C - 1% chance on not winning, any other way its 7 rounds (140sec)
B: 1E 189C - 0,4% chance on not winning, any other way its 7 rounds (140sec)
C: 79R 126E 45K - 2 rounds of fighting (30sec)
Well actually my block (gen A) started the countdown and the main battle (gen C) finished around 1 sec earlier. Was a little tight but success!