fester01 isn't on the servers but if you'd been successful uploading it, then it would be available immediately.
If I might make a suggestion, and I'm pretty sure you know what's needed to do this. Instead of uploading it as fester01, pick the current version on the server that you don't want to be the final name, i.e. fester, and after making a backup copy of your sources, upload the new terrain as fester using the fester host files instead of fester01. If there are no problems then you should see the new terrain download to your FE when you open your custom arena.
I'm curious why you didn't stay with festerma for the name? I liked it.
I wouldn't upload it as fester01 as that might require Skuzzy to delete it before he could start building it with his tools. I think it would have been worth it for festerma hehe