I didn't make this. Credit goes to... someone... from another forum :S
Smex
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For high level arena sessions, you might not have enough troops to be seperated into 2 squads, therefore it is essential to learn to complete an arena session within the 3 hours time limit using 1 squad only. (actually it is also applicable to lower level arena sessions, so you can complete relatively higher level sessions using less troops)
Have fun.
NOTE: 22 stops.