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:
Xmas Elf -R- #260: The path costs 860 coins.
Winter Comet -VR- #1006: The path costs 2825 coins + 1 key = 3285 coins.
Joy -E- #1128: The path costs 3630 coins + 2 keys = 6005 coins.
Murdralux -L- #1620: The path costs 6020 coins + 3 keys = 10830 coins.
Timelimited:
28 - 30: Christmas Dinner -L- #1: The path costs 8165 coins.
29 - 30: Enlightened Lapis -L- #1: The path costs 6720 coins.