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Once, I was offered to play the map "Barbarian Raid."
I played it at one point, without HD Mod and not timed. It took me 20 days. I think it could be done faster.
I'm not including saves. I played like this:
Start with the brown faction, Dungeon. Shakti has 3 stacks of troglodytes.
Immediately get a lair with 8 wyverns and run to the first barbarian.
8 wyverns take down one enemy at a time. Then go to the second barbarian, and so on.
The difficulty lies more in the tunnels and gates (it takes a long time to run). But the ready-made barbarian armies don't pose any threat.
Who could complete it in 20 days?