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I think I have an idea what happened last night. I have no proof, and I'm just spitballing based on my experiences and what has been posted on their Discord. NovelAI has a few limiters in place to stop people like me from mass genning stuff. The specifics as to what these limits are is kept secret, but most people believe there is a image per hour and per day limit. They seem to have reduced the threshold for the per hour limiter as I didn't encounter that one yesterday. This is likely due to the improvements in image gen speed. I believe I hit the per day limiter yesterday, as I was only ever rate limited for more than 20 minutes was once when I'm certain I hit the daily limit. That being said, I'm certain they reduced the amount of images you need to gen to hit the daily limit.
The two solutions to this are either I buy a sub and use 2 accounts, or I only bulk gen after I do requests for you guys. I'm probably not going to buy a sub since I'm still busy with work, so for now I'll do the latter for now.
tl;dr, I shouldn't get rate limited again doing requests.
I also edited the OP to include ThatOneAiAnon's tool and I realized I edited out the word 'tool' so it just says 'locally run html'...
Give requests.