Mini Dungeon Limit, theres a limit? xD

Mardia - Demethos: 15 x 20 x 6 = +1,800 people able to train during 2x events (+300 per server at minimum)

Expect a minimum of +3,500 people throughout gMS able to train during 2x if all channels are taken.

1. Mardia-Demethos only have 13 channels.
   
2. Your math is a bit off, see spoiler.
   
3. An average of two to three per party is more likely.
   

 Maths

C is a constant for channels, which are invariable in this formula
C = (6*19)+(4*13) = 166
Min is therefore:
X = 20
Y = 1
c*x*y = 3,320 = 166*20

And Max is therefore:
X = 30
Y = 6
c*x*y = 29,880 = 166*30*6

Average pessimistic assumption is therefore:
X = 20
Y = 2
c*x*y = 6,640 = 166*20*2

Then you actually double these values, because there is a mini-dungeon for both Newties and for Skeles, so two sets of potential for the minis alone.