What is the longest TFT game ever?

I was curious as to how long a TFT game can go for. The furthest I've seen was stage 7-3 I believe. I really want to know what boss is on stage 7 or even stage 8 so if anyone has gotten that far I would appreciate it if you could send some footage or just say what the bosses were. I know elder dragon is the boss of stage 6 so maybe 7 would be baron but then I have no idea after that.
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