Maze explanation is here.

Startbonus: 400 coins
Collections: 600 coins every 8 hours (5400) = 5800 coins.
The total does not include coins we can get from quests or dragon tv.
For Collecting times check this.

Dragons:
Oni -R- #254: The path costs 860 coins.
Boss -VR- #350: The path costs 2825 coins + 1 key = 3285 coins.
Robin Hood -E- #215: The path costs 3630 coins + 2 keys = 6005 coins.
Knife Bandit -L- #1604: The path costs 6020 coins + 3 keys = 10830 coins.

Timelimited:
23 - 25: Sand Vixen -L- #1504: The path costs 8165 coins.
24 - 25: Queen´s Champion -L- #1440: The path costs 6720 coins.

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