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The topic is interesting; perhaps there will be many records for different maps here someday. Let's hope so.
I'll add a couple of maps myself.
1) **South of Hell** – 18 days, but this isn't a definitive result. I didn't use any external programs (like Heroecop), and I didn't use the "warrior tombs" that are scattered around the map. If you use wings, I think you could get a much faster time.
2) **Barbarian Invasion** – 11 days. The map is small but difficult; it's mostly empty except for one big problem. I'm not sure how much I can improve the result. I played as Red using the standard settings. There's a screenshot below; maybe it would have been worth taking the boots of speed on that hero.
I started with smaller maps like "Always Ready!", "Key to Victory," and "Knee-Deep in Death." These are great for beginners because you just have to run from point A to point B as quickly as possible without any complicated strategies.