How many points did you score in the leaderboard, on which maps, and what was the maximum possible score?

POINTS = [200 - (D + 10)/(Z+5) + B + G]*R,
where D is the number of days spent
Z is the number of castles captured
B is a bonus for defeating all enemies (25 points) - however, if the map does not specify the condition "Defeat all enemies", this bonus will not be counted.
G is a bonus for the Grail (25 points)
R is the game difficulty coefficient (maximum - 2)

Total:
if there are 16 castles on the map, the difficulty is 200%, the task is completed, and the Grail is found, then:
POINTS = [200 - (D + 10)/(16+5) + 25 + 25]*2
The focus of the calculation is that (D + 10)/(Z+5) only takes the integer part,
to get 500 points, you need to complete everything in 10 days
(10 + 10) / (16 + 5) = 0.95, this is rounded down to 0 in the calculation.
(31 + 10) / (16 + 5) = 1.95, this is rounded down to 1 in the calculation (i.e., the total is 498).
In WOG with double turns + enchantments on obelisks + an artifact for leveling up, I achieved this on a random XL map (50 saves in 10 days).
On a custom map with 20 castles, you can also do everything in 15 days.