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NikitaStoff, yes, I also took about the same amount of time to reach the second city. All creatures on the map have their growth disabled, so it probably just seemed that way – you simply moved to a stronger location. You can take your time and complete some quests; there are several near the elves that don't require battles, and then you can start clearing the territory. While waiting, you can earn income from interest in the bank, and if you repair the shipyard in the imperial city, you can restore the operation of the mines.
NIK21, time will not affect the final boss. Time only affects two types of monsters:
1) Those that respawn after a certain time at the location of killed units on the map (their strength is determined by the month in which they respawn, but it does not increase further).
2) Those that sometimes attack from ambushes while traveling on roads.
Perhaps you haven't encountered either of these yet.