It depends on what you did.
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Generally, when a web site says you are banned, it is permanent. If they say your account is suspended, then they usually have a certain amount of time it is suspended before you gain access to the account again.
Typically, it lasts one hour. However, if you are caught hacking, your account is permanently banned.
Diamond armor is definitely the best armor in minecraft. It protects you the most and last for a really long time.
Forever!
Void, because in the long run, void would provide more ranged strength bonuses when actually firing projectiles.