So much has been written here... :)
I've completed it 2 times, and the result is the same. I think there will be several winners with identical results (the walkthrough algorithm for this map is too simple and leaves no room for variation). The computer's actions may vary, but that's +/- 1 day.
In one case, the AI messed itself up against me on its turn (and with two heroes at once); after a reload, it didn't attack even once!!! Just imagine sending your final save like that :) :)
Dismissed heroes never appear in the tavern immediately (only when the week changes, in the standard random way). Retreating with a hero and moving on the same turn is forbidden!!! (On this map, that would be absolute cheating!)
That's pretty much all; the only thing is, you'll actually have to try and finish the map with the "strongest" hero. :)
I'm not sending the save, I hope to improve the result :).
Good luck everyone! :)