My custom Dungeon-ish 23 schedule works out like this.

1st of the month, general idea for the dungeon. Than every 3 days, I create the idea for the room, describe an interesting detail, and finally the basic map.
This works out to creating around a ten room dungeon every month.

Did this because with busy schedule I felt this was less pressure but it still helped me with the creative ideas to create some fun things. #dungeon23