Oh i have no legitimate proof to back this up but i think that medal drop rates go down during the weekend. I feel the way for two reasons.

Reason 1: I have noticed that the amount of medals i get during the dwarf the amount i get during weekends. during the days of mon-thu i get 3-7 medals a day farming npcs. thats more medals then i usually get in a whole weekend fri-sun. Thats just my experience

Reason 2: The weekend is when players have more time to commit to playing the game. For players who cant find the time to play mon-thu, will be more likley to buy coins to get medals because when they have the time to play they dont get medals often.

like i said earlier i have no legitimate proof to give this statement any validity but this is the way i feel from what i have grasp from this game. the data i have provided in this additional post talks about medals in general. Lol a honor medal on the weekend pssshh yeah right.