Same amount of characters, yet “mine” (I didn’t register anything, I have nothing to gain by proving I have… the longest… anything…) is clearly longer, when written in a script that has variable letter width:
VS
Edited to add: It seems the max with for a BBS post is also 63 octets (whatever the F a octet is) since all the dot’s in my suggested name nicely line up with the end of the post 
Edited again to comment on the previous edit: Obviously that is not how it works, this is just a coincidence since the BBS uses variable letter width, which I already knew of course…