XF 2.2 Username lengths (changing number of characters)

DigNap15

Well-known member
HelloXF Username Length.png
My username length is set to 25 characters.
I see it can be set to between 3 and 50 characters
I would like to shorten it to say 20 characters (due to the fact that some of my members chose very long problematic names)
If I shortened it to 20 characters would this apply to new members only
Ie I need to know if it would affect all of my current members with long names
 
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