Maze explanation is here.

Start bonus: 400 coins

Collections: 600 coins every 8 hours (7200) = 7600 coins.

The total does not include coins we can get from quests or dragon tv.

For Collecting times check this.

*Dragons:*

Hypno -R- #208: The path costs 860 coins.

Chibi Chief -VR- #1091: The path costs 2825 coins + 1 key = 3285 coins.

Space -E- #282: The path costs 3630 coins + 2 keys = 6005 coins.

Echo Terror -L- #1583 -L- #1532: The path costs 6020 coins + 3 keys = 10830 coins.

Timelimited:

22-26: Preston Flash -L- #1587: The path costs 8165 coins.

25-26: Obscure Darkness -L- #1356: The path costs 6720 coins.