Wireless router passphrase

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Having got into the router settings page with Igorian's gracious help I am now thinking of upgrading the WPA-PSK passphrase to more characters.
A couple of questions have arose

As the maximum size of the phrase can be up to 64 ascii characters i thought what the hell and after using a secure password generating program i have decided to go the whole hog with a 64 character passphrase, question is could having such a long passphrase have speed implications or will any speed restriction on the sytem be negligible?

Do the settings made in the browser especially when communicating wirelessly as opposed to ethernet, get sent in a secure manner with encryption to the router or is it a likelihood that the information could be hijacked? would it be unwise then to change settings wirelessly?
 
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Once the encryption is set, the ends of the "tunnel" you create between you and the router are encrypted as is all the data inside.

It's always best to use a wired connection to carry out router maintenance.

Encryption key changes are very quick and you are unlikely to experience any problems.
 
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