So I finally bit the bullet and did the auto conquer thing so I could do the battles. I like them.
Is there any rhyme or reason, like top of the hour, to when the battles start? It seems sometimes I will get 2 in an hour, then won't see one for 8 hours.
A battle starts once filled, or if more than 10 players are present after 6 minutes of waiting (so at xx:06:00 and xx:36:00). If less than 10 players are present after 6 minutes, the battle is deleted.