Confirmed.
On the first week, day 1-6 at the Castle, an external dwelling of shooters, broke through with losses and took the Necropolis secondary hero. On the second week, I took 2 Medusa dwellings, the Scepter, a mini Griffin Conservatory, and 3 more towns. On the third week, I bought the army and broke through to the opponent. No Earth magic, have Expert Air, but no Haste. 500 Skeletons decided it.