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Description
The ban command currently just accepts a number of days. If an invalid number of days is provided (e.g. more than 7), a generic fatal error will be shown and the command will crash and be logged.
Now that Discord allows bans to purge any number of seconds between 0 and 7 days, we should improve this to parse the user's input to determine exactly how much time, and a proper error messages should be shown for invalid inputs.