AdminCP>Usergroups>Usergroup Manger>Usergroup
First block you will see this
Quote:
Password Expiry (If you specify a number of days here, users will be required to change their password when this amount of time elapsed since they last changed)
Password History (If you specify a number of days here, users will not be allowed to change their password to a value that they have used in the past x days.
Note: this setting has no effect if password expiry is set to 0 days)
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Set to whatever you want.