Trusted IPs - clearer on refresh internval

the refresh runs every hour, so the delay could be as small as 1 minute if he does it at xx:59 or as big as 59 minutes if he does it at xx:01

either change string when adding to someting like "update can take up to 1h".

or

some text in the page "settings take up to 1h to be enforced".

thanks.