Walkthroughs for custom maps.

If it were also possible to easily edit the properties of creatures and spells, then the maps would be on a completely different level. I don't know how this would work from a technical point of view.

I tested this idea experimentally. Indeed, after 1171-1-7 (32767 days), you can pass any passage guard limited by a non-negative time, i.e., less than 37268 days. In the attached save, the guard allows passage up to 112, but it can still be passed on 1171-2-1. Thus, all such timings, except for direct defeat within a certain time/direct victory for the computer, become irrelevant)
Yes, this feature also allows you to create guards limited not only by the condition "no later than," but also "no earlier than" - if only someone in their right mind would come up with a map for 1170+ months).