Are arena medals worth grinding for? If you have 71 years, then maybe. (Beware some math here)
Bronze medals take 6.58 years to complete?
Bronze medals per win at Tier III: 1 medal
Great Hall medals needed to completely kit out Bronze: 12,000 medals (50 + 150 + 300 = 500) (500 x 24 = 12,000)
If a mission takes 1 minute to complete, 60 medals per hour: That is 2,00 hours of arena duels. That is 8.33 days of grinding arena missions and winning. (12,000 / 60 = 200) (200 / 24 = 8.33)
A refresh of opponents every 15 minutes gives 10 opponents. That is 40 opponents per hour giving 20 minutes of waiting for refresh per hour. So this makes it 300 hours of arena duels. That is 12.5 days of grinding arena missions and winning. (12,000 / 40 = 300) (300 / 24 = 12.5)
Of the 10 opponents 2 of them I have a conceivable chance to win. That gives 13 minutes of downtime per 15 minutes refresh cycle. 52 minutes of downtime per hour. With 8 medal wins per hour: That gives 1,500 hours or 62.5 days. (12,000 / 8 = 1,500) (1,500 / 24 = 62.5)
Now if you need to sleep 8 hours a day, That is 16 hours per day of grinding medals. This gives 93,75 days of grinding arena missions and winning. (1,500 / 16 = 93.75)
Now a more realistic look at this is a person doing the 5 arena missions per day. If they win all of these missions that will give 2,400 days.or 6.58 years: (12,000 / 5 = 2,400) (2,400 / 365 = 6.575)
So for all Bronze, Silver, and Gold medals:
Bronze medals would take 2,400 days or 6.58 years. (12,000 / 5 = 2,400) (2,400 / 365 = 6.575)
Silver medals would take 7,200 days or 19,73 years. (36,000 / 5 = 7,200) (7,200 / 365)
Gold medals would take 16,320 days or 44.71 years. (81,600 / 5 = 16,320) (16,320 / 365)
So to get all 129,600 medals at 5 medals per day would be 25,920 days or 71 years. (12,000 + 36,000 + 81600 = 129,600) (129,600 / 5 = 25,920) (25,920 / 365 = 71.01)
So in conclusion... 71 years to complete the medals in the Great Hall. In my opinion, is it worth the effort? Not really. Even if this game lasted 71 years (probably unlikely) would it be worth the 20% increase to HP ATK, and DEF. Or for a 25% increase to C.DMG? Or an 80 point increase to RESIST and ACC?
Maybe it is time to reduce the medal cost or increase the medals awarded.