I don't know how long it would take me, but I would try to complete it in the same number of days it takes a highly skilled logistics expert, wearing boots and gloves, to reach the final battle.
THAT'S IT! You hit the nail on the head! That's exactly why I had that strategy – to focus all my efforts on quickly opening and clearing all zones, and capturing castles! Maximum number of heroes. Large financial losses (buying heroes), which means less investment in building to produce troops! I read that the great offline player vbn wrote something similar, that you need to try to play exactly like this, and not focus on building troops at the expense of opening everything as quickly as possible. And Tolikandro says that my strategy is wrong.