How many username characters is too many?

[User]

The XF default setting is to allow up to 25 characters per user name.

Of course we all know that you will get that special case user who will insist on creating a username that actually has 25 characters, and all upper case w at that. This will result in either styles completely breaking or at least looking funky.

How many characters do you allow per username on your forum?

 

[dieketzer]

i found 16 to be the number at which users arent able to disrupt the style flow.
this may vary though, depending upon any changes that have been made to the style.