Yeah, of course it varies place to place but I think for the majority of at least somewhat developed countries and urban areas in less developed countries 50Mbps is a reasonable figure for “normal home internet” - even at 25Mbps you’re looking at 4½ hours for 50GB which is very doable if you leave it going while you’re at work or just in the background over the course of an evening
Yeah even gpt4o couldn’t keep track of encounters, run battles etc. in my case…
I think if you wanted to do it mechanically consistently you’d probably need to integrate it into a vtt where you give it context and potentially fine-tune it to give quest related summaries & gming rather than just “stuff”