I made the mistake of changing my name to something too long. When I went to logon, I couldn't type the entire name in the entry field, so I could no longer logon. Luckily, a friend EP support person was able to change my name back to my old name.
I guess longer is not always better.
I can't even remember about 90% of my usernames. The first one was AlanGreeneEatsPizza, and I've gone back to that several times. It still might be my favorite.
And I made the mistake twice of changing my username to something too long.