Perhaps the party limit will be 4 with an invisible character in DM mode? In any case anywhere between 4 to 6 would be ok because just because if you had 6 you don't need to utilize 6. Some people will want to go through the game with their 1 character.

Thanks for reading...

Razorback aka Daevin Aruth
"Nullius Pavet Occursum" = "He fears not meeting with any one"
Gold is the money of kings, silver is the money of gentlemen, barter is the money of peasants, and debt is the money of slaves...
https://discord.gg/jxA5AvA