Why is there no refund for the 48 hours maintenance?

[DPZ2]

2 days is excessive for a "live service." Meanwhile, all other games I've played only have less than 12 hours of maintenance. Some even don't have maintenance, they update on the run while you're playing the game.

Candy Crush is not a good example.

The network requirement as 1 million players download 50 gigabytes of game data is enough reason to spread a major expansion maintenance across at least 2 days.