Oh, updating your fic is perfectly fine no matter how long it's been. I know it can take longer than a month to update a story, so as long as the author bumps their own thread, they're fine.
Go ahead and post in the same thread. You won't get in trouble.
Hello Astinus, I was wondering if I could update my fic that is over 2 months old. Is it possible for me to continue it or do I have to open up a new thread?
I rather not open a new one, since it only has one chapter. Let me know soon, thanks.