ETERNITY'S REACH
Recall all your troops from gathering before you join. If any army is out gathering when it starts, you can't enter.
30 minutes, solo. You get free troops and can't attack other players, so this is all about strategy.
Hunt monsters constantly, grab copper veins on repeat, and rush any Fractured Vein the second it spawns. In the last few minutes, just touch the center once, you don't need to hold it.
Pick a time slot where you can actually focus for the full 30 minutes.