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Question & Answers
Answer from: Dontbother
Shields are to prevent enemies from attacking you for a limited amount of time. Some players repeatedly buy shields to make sure they never get attacked. To prevent this, the game has a cool down period for shields during which you cannot buy them. It's something like this :
Shield Period Cool Down Period
1 day 5 days
2 days 10 days
7 days 35 days
Note how the cool down period is 5 times the shield period.