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I played as planned, using the Demons (with a secondary hero), and knowing the map, I hoped to achieve a better result against the African Mages, but unfortunately, it didn't work out: (
After destroying the lower outposts separating the Demons and the African Mages, I didn't attack the main hero's towns. Instead, I let the second hero deal with them, saving almost a week. Meanwhile, I sent Debilka (she was the main hero) with an advance guard of three dozen Succubi and a hundred Dogs to the north.
But things didn't go as smoothly for Debilka in the north as they did for Letos. After breaking through the coastal outpost of humans near the capital, she encountered fierce resistance from two enemy heroes with a high threat level, and her Plasma Cannon wasn't as effective as Letos's Plague, and the units couldn't hide. I had to replay a couple of turns and, for the time being, settle for a border town near the barbarian lands, which became a base where I could retreat. As a result, after retreating once and preserving the main forces that were waiting for Debilka in the town, she almost without losses destroyed the already battered human troops and finally captured the capital. Then, the main Demon forces arrived by sea, and everything went smoothly - a Light Elf hired in a tavern captured the third human Castle with the help of human troops, and Debilka, without significant losses, cleared the Orcish and Dwarven lands of their inhabitants. At the end, the Dwarves even started sailing - I had to chase them all over the sea, which took another day. Fortunately, the second hero (the fast hero, Grok) was not far from the shore, and the Light Elf passed his troops to him in a chain. And to prevent the cowardly Dwarven heroine from fleeing, I had to transfer only part of Gorka's troops to her, giving her a twofold advantage over Grok (although it didn't help her - the battle was still one-sided).
The result is 46 days. Replays of some battles are attached.
I think I'll replay this map with the Orcs later, but I don't see any particular prospects for improving the result against the African Mages - the outposts are too strong to break through quickly without magic.