Well, 15 days have passed – we can start the discussion :)

The lack of tournament experience (this is my first tournament) definitely had an impact. :D
The result was 38th day. I completed it on the last day in one go (I didn't have the time or energy to replay).

Last night, I sat down and thought about it more carefully (played for almost 4 hours - 3 attempts) and realized that I made 3 strategic mistakes that seriously affected the result.

1. I started clearing artifacts too late (in the fifth week).
2. I only bought one support unit.
3. I took Logistics too late.
4. I wasted time trying to catch and kill the blue player who was running to capture my castle (I lost two days (catching up and returning) back).

Today, I started clearing from day 22 with red dragons, having an expert in Logistics, bought more support heroes, and allowed the blue player to capture my castle.

The result is 29 days.

I risk assuming that the leader's result will be 22-24 days.