Heroes-4 "Deep forest" off-line Tournaments!

I was choosing such maps. But what about the limits regarding the map size?

I did some calculations regarding the leprechauns, and it turns out that
On the first day, Sandro can easily increase his mana level with their help (ideally up to 324 units, plus his initial 40, totaling 364 units). With that level, he might not even need to return to the castle.
I also calculated a bit, and according to my walkthrough, there is
(but it seems only theoretically) a possibility to put Sandro in a boat at the end of the sixth day. But that would be an even bigger hassle than clearing out the nomads with fairies on the first day, as you suggested.:)