Maze explanation is here.

Startbonus: 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:*

Shadow -R- #859: The path costs 860 coins.

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

Katera -E- #1068: The path costs 3630 coins + 2 keys = 6005 coins.

Tentacle Amalgam -L- #1473: The path costs 6020 coins + 3 keys = 10830 coins.

Timelimited:

26 -28: Elusive -L- #720: The path costs 8165 coins;

27 -28: Dark Commander -L- #1101: The path costs 6720 coins.